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Tính số hs giỏi của lớp 6D ở hk1 biết hk2 có thêm 8 bạn giỏi

Học kì 1, số học sinh giỏi của lớp 6D bằng 2/7 số học sinh còn lại. Sang học kì 2, số học sinh giỏi tăng thêm 8 bạn(số học sinh cả lớp không thay đổi), nên số học sinh giỏi bằng 2/3 số học sinh còn lại. Hỏi học kì 1 lớp đó có bao nhiêu số học sinh giỏi?

Giải hộ mk thật chi tiết nha~~~

Theo dõi Vi phạm
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  • Học kì 1, số học sinh giỏi của lớp 6D bằng \(\dfrac{2}{7}\) số học sinh còn lại

    \(\Rightarrow\) Học kì 1, số học sinh giỏi của lớp 6D bằng \(\dfrac{2}{9}\) số học sinh cả lớp.

    Học kì 2, số học sinh giỏi của lớp 6D bằng \(\dfrac{2}{3}\) số học sinh còn lại

    \(\Rightarrow\) Học kì 2, số học sinh giỏi của lớp 6D bằng \(\dfrac{2}{5}\)số học sinh cả lớp.

    8 bạn ứng với số phần học sinh cả lớp là:

    \(\dfrac{2}{5}-\dfrac{2}{9}=\dfrac{8}{45}\)(số học sinh cả lớp)

    Số học sinh của lớp 6D là
    \(\dfrac{8.45}{8}=45\)(học sinh)

    Học kì 1 lớp đó có số học sinh giỏi là:

    \(45.\dfrac{2}{9}=10\)(học sinh)

    Đáp số: 10 học sinh

      bởi NGUYEN DUC HAI 19/12/2018
    Like (0) Báo cáo sai phạm

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  • Câu 1:Tính

    a 4.52-3.(24-9)

    b 7+6.(1https:https:https://hoc247.net/image/faq/data2/710107_.https://hoc247.net/image/faq/data2/710107_.hoc247.nethttps://hoc247.net/image/faq/data2/710107_.imagehttps://hoc247.net/image/faq/data2/710107_.faqhttps://hoc247.net/image/faq/data2/710107_.data2https://hoc247.net/image/faq/data2/710107_.185200_.https:https://hoc247.net/image/faq/data2/710107_.https://hoc247.net/image/faq/data2/710107_.hoc247.nethttps://hoc247.net/image/faq/data2/710107_.imagehttps://hoc247.net/image/faq/data2/710107_.faqhttps://hoc247.net/image/faq/data2/710107_.data2https://hoc247.net/image/faq/data2/710107_.185200_.hoc247.nethttps:https://hoc247.net/image/faq/data2/710107_.https://hoc247.net/image/faq/data2/710107_.hoc247.nethttps://hoc247.net/image/faq/data2/710107_.imagehttps://hoc247.net/image/faq/data2/710107_.faqhttps://hoc247.net/image/faq/data2/710107_.data2https://hoc247.net/image/faq/data2/710107_.185200_.imagehttps:https://hoc247.net/image/faq/data2/710107_.https://hoc247.net/image/faq/data2/710107_.hoc247.nethttps://hoc247.net/image/faq/data2/710107_.imagehttps://hoc247.net/image/faq/data2/710107_.faqhttps://hoc247.net/image/faq/data2/710107_.data2https://hoc247.net/image/faq/data2/710107_.185200_.faqhttps:https://hoc247.net/image/faq/data2/710107_.https://hoc247.net/image/faq/data2/710107_.hoc247.nethttps://hoc247.net/image/faq/data2/710107_.imagehttps://hoc247.net/image/faq/data2/710107_.faqhttps://hoc247.net/image/faq/data2/710107_.data2https://hoc247.net/image/faq/data2/710107_.185200_.data2https:https://hoc247.net/image/faq/data2/710107_.https://hoc247.net/image/faq/data2/710107_.hoc247.nethttps://hoc247.net/image/faq/data2/710107_.imagehttps://hoc247.net/image/faq/data2/710107_.faqhttps://hoc247.net/image/faq/data2/710107_.data2https://hoc247.net/image/faq/data2/710107_.185200_.775362_.2)2

    c 25.7+25

    Câu 2:Tìm x

    a (x-15):5+22=24

    b |x+7|=15-(-4)

    c (x-1https:https:https://hoc247.net/image/faq/data2/710107_.https://hoc247.net/image/faq/data2/710107_.hoc247.nethttps://hoc247.net/image/faq/data2/710107_.imagehttps://hoc247.net/image/faq/data2/710107_.faqhttps://hoc247.net/image/faq/data2/710107_.data2https://hoc247.net/image/faq/data2/710107_.185200_.https:https://hoc247.net/image/faq/data2/710107_.https://hoc247.net/image/faq/data2/710107_.hoc247.nethttps://hoc247.net/image/faq/data2/710107_.imagehttps://hoc247.net/image/faq/data2/710107_.faqhttps://hoc247.net/image/faq/data2/710107_.data2https://hoc247.net/image/faq/data2/710107_.185200_.hoc247.nethttps:https://hoc247.net/image/faq/data2/710107_.https://hoc247.net/image/faq/data2/710107_.hoc247.nethttps://hoc247.net/image/faq/data2/710107_.imagehttps://hoc247.net/image/faq/data2/710107_.faqhttps://hoc247.net/image/faq/data2/710107_.data2https://hoc247.net/image/faq/data2/710107_.185200_.imagehttps:https://hoc247.net/image/faq/data2/710107_.https://hoc247.net/image/faq/data2/710107_.hoc247.nethttps://hoc247.net/image/faq/data2/710107_.imagehttps://hoc247.net/image/faq/data2/710107_.faqhttps://hoc247.net/image/faq/data2/710107_.data2https://hoc247.net/image/faq/data2/710107_.185200_.faqhttps:https://hoc247.net/image/faq/data2/710107_.https://hoc247.net/image/faq/data2/710107_.hoc247.nethttps://hoc247.net/image/faq/data2/710107_.imagehttps://hoc247.net/image/faq/data2/710107_.faqhttps://hoc247.net/image/faq/data2/710107_.data2https://hoc247.net/image/faq/data2/710107_.185200_.data2https:https://hoc247.net/image/faq/data2/710107_.https://hoc247.net/image/faq/data2/710107_.hoc247.nethttps://hoc247.net/image/faq/data2/710107_.imagehttps://hoc247.net/image/faq/data2/710107_.faqhttps://hoc247.net/image/faq/data2/710107_.data2https://hoc247.net/image/faq/data2/710107_.185200_.775362_.2):1https:https:https://hoc247.net/image/faq/data2/710107_.https://hoc247.net/image/faq/data2/710107_.hoc247.nethttps://hoc247.net/image/faq/data2/710107_.imagehttps://hoc247.net/image/faq/data2/710107_.faqhttps://hoc247.net/image/faq/data2/710107_.data2https://hoc247.net/image/faq/data2/710107_.185200_.https:https://hoc247.net/image/faq/data2/710107_.https://hoc247.net/image/faq/data2/710107_.hoc247.nethttps://hoc247.net/image/faq/data2/710107_.imagehttps://hoc247.net/image/faq/data2/710107_.faqhttps://hoc247.net/image/faq/data2/710107_.data2https://hoc247.net/image/faq/data2/710107_.185200_.hoc247.nethttps:https://hoc247.net/image/faq/data2/710107_.https://hoc247.net/image/faq/data2/710107_.hoc247.nethttps://hoc247.net/image/faq/data2/710107_.imagehttps://hoc247.net/image/faq/data2/710107_.faqhttps://hoc247.net/image/faq/data2/710107_.data2https://hoc247.net/image/faq/data2/710107_.185200_.imagehttps:https://hoc247.net/image/faq/data2/710107_.https://hoc247.net/image/faq/data2/710107_.hoc247.nethttps://hoc247.net/image/faq/data2/710107_.imagehttps://hoc247.net/image/faq/data2/710107_.faqhttps://hoc247.net/image/faq/data2/710107_.data2https://hoc247.net/image/faq/data2/710107_.185200_.faqhttps:https://hoc247.net/image/faq/data2/710107_.https://hoc247.net/image/faq/data2/710107_.hoc247.nethttps://hoc247.net/image/faq/data2/710107_.imagehttps://hoc247.net/image/faq/data2/710107_.faqhttps://hoc247.net/image/faq/data2/710107_.data2https://hoc247.net/image/faq/data2/710107_.185200_.data2https:https://hoc247.net/image/faq/data2/710107_.https://hoc247.net/image/faq/data2/710107_.hoc247.nethttps://hoc247.net/image/faq/data2/710107_.imagehttps://hoc247.net/image/faq/data2/710107_.faqhttps://hoc247.net/image/faq/data2/710107_.data2https://hoc247.net/image/faq/data2/710107_.185200_.775362_.3+5https:https:https://hoc247.net/image/faq/data2/710107_.https://hoc247.net/image/faq/data2/710107_.hoc247.nethttps://hoc247.net/image/faq/data2/710107_.imagehttps://hoc247.net/image/faq/data2/710107_.faqhttps://hoc247.net/image/faq/data2/710107_.data2https://hoc247.net/image/faq/data2/710107_.185200_.https:https://hoc247.net/image/faq/data2/710107_.https://hoc247.net/image/faq/data2/710107_.hoc247.nethttps://hoc247.net/image/faq/data2/710107_.imagehttps://hoc247.net/image/faq/data2/710107_.faqhttps://hoc247.net/image/faq/data2/710107_.data2https://hoc247.net/image/faq/data2/710107_.185200_.hoc247.nethttps:https://hoc247.net/image/faq/data2/710107_.https://hoc247.net/image/faq/data2/710107_.hoc247.nethttps://hoc247.net/image/faq/data2/710107_.imagehttps://hoc247.net/image/faq/data2/710107_.faqhttps://hoc247.net/image/faq/data2/710107_.data2https://hoc247.net/image/faq/data2/710107_.185200_.imagehttps:https://hoc247.net/image/faq/data2/710107_.https://hoc247.net/image/faq/data2/710107_.hoc247.nethttps://hoc247.net/image/faq/data2/710107_.imagehttps://hoc247.net/image/faq/data2/710107_.faqhttps://hoc247.net/image/faq/data2/710107_.data2https://hoc247.net/image/faq/data2/710107_.185200_.faqhttps:https://hoc247.net/image/faq/data2/710107_.https://hoc247.net/image/faq/data2/710107_.hoc247.nethttps://hoc247.net/image/faq/data2/710107_.imagehttps://hoc247.net/im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    Câu 3:

    1)Cho A= 1-2+3-4+5-6+...+99-100

    a Tính A

    b A có chia hết cho 2,3 và 5 không?

    c A có bao nhiêu ước tụ nhiên? bao nhiêu ước nguyên?

    2)Thay a,b bàng các chữ số thích ợp sao cho:24a68b chia hết cho 45

    3)Cho a là một số nguyen có dạng a=3b+7(b thuộc Z)

    Hỏi a có thể nhận được những giá trị nào?tại sao?

    a=11 a=2002 a=2003 a=11570 a=22789 a=29563 a=299537

    Câu 4:

    a Tìm số tự nhiên nhỏ nhất sao cho số đó chia 9 dư 5 chia 7 dư 4 chia 5 dư 3

    b Cho A=1+20122+20123+...+201272

    B=201273-1

    So sánh A với B

    19/12/2018 |   2 Trả lời

 

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