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Tính chiều cao của hình tam giác biết độ dài đáy 3/5m

Một hình tam giác có độ dài đáy là \(\frac{3}{5}\)m ,diện tích là \(\frac{2}{5}\)m2.Tính chiều cao của hình tam giác đó.

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  • Chiều cao của tam giác đó là:

    S=\(\frac{ah}{2}\Rightarrow h=\frac{2S}{a}=\frac{2.\frac{2}{5}}{\frac{3}{5}}=\frac{4}{3}\) (m)

    Vậy chiều cao tam giác là \(\frac{4}{3}m\)

      bởi Nguyễn Khánh 19/12/2018
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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 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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

  • Trên nửa mặt phẳng bờ chứa ria õ,vẽ hai tia oy và oz sao cho xoy=20; xoz=100

    a) Tính góc yOz
    b) Vẽ tia Ot là tia đối của tia Õ. Chứng tỏ Oz là phân giác của góc toy

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  • Tìm x :

    a) 3x + 5 chia hết cho x-1

    b)7x - 6 chia hết cho x + 2

    Giúp mình nha haha

    19/12/2018 |   1 Trả lời

  • 1 . Tìm x

    5 . ( x - 3 ) = 2x + 4

    19/12/2018 |   1 Trả lời

  • Tính giá trị biểu thức:

    C=\(\dfrac{-1}{7}\)x\(\dfrac{5}{9}\)+\(\dfrac{-5}{9}\)x\(\dfrac{1}{7}\)+\(\dfrac{-5}{9}\)x\(\dfrac{5}{7}\)

    D=\(\dfrac{4}{2x3}\)+\(\dfrac{4}{3x4}\)+\(\dfrac{4}{4x5}\)+....+\(\dfrac{4}{8x9}\)

    A=\(\dfrac{5}{9}\)-\(\dfrac{5}{8}\)+\(\dfrac{2}{3}\)+\(\dfrac{4}{9}\)+\(\dfrac{-3}{8}\)+\(\dfrac{1}{3}\)

    B=\(\dfrac{1}{2}\)+\(\dfrac{1}{6}\)+\(\dfrac{1}{12}\)+\(\dfrac{1}{20}\)+\(\dfrac{1}{30}\)+\(\dfrac{1}{42}\)+\(\dfrac{1}{56}\)

    19/12/2018 |   1 Trả lời

  • Bài 1 : Tính

    a) \(\dfrac{5}{3}+\dfrac{3}{-4}+\dfrac{7}{6}\)

    b) \(\dfrac{-1}{5}+\dfrac{5}{3}+\dfrac{-3}{2}\)

    c) \(\dfrac{2}{7}+\dfrac{-7}{5}+\dfrac{-2}{35}\)

    d) 3+\(\dfrac{-7}{2}+\dfrac{-1}{5}\)

    Nhanh lên chiều nay mik hok rồi !!!!

    19/12/2018 |   1 Trả lời

 

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