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Thực hiện phép tính 1/3+(-13)/21+5/7+1/6+1/14+(-1)/2

Thực hiện phép tính:

a) 1/3 + -13/21 + 5/7 + 1/6 + 1/14 + -1/2

b) 1/3 + -1/4 + 1/5 + -1/6 + 1/7 + 1/6 + 1/-5 + 1/4 + 1/-3

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Trả lời (1)

 
 
 
  • \(\dfrac{1}{3}+\left(\dfrac{-1}{3.7}+\dfrac{-3.4}{3.7}\right)+\dfrac{5}{7}+\dfrac{1}{3.2}+\dfrac{1}{2.7}+\dfrac{-1}{2}=\dfrac{1}{3}-\dfrac{1}{3}.\dfrac{1}{7}-\dfrac{4}{7}+\dfrac{5}{7}+\dfrac{1}{3}.\dfrac{1}{2}+\dfrac{1}{2}.\dfrac{1}{7}-\dfrac{1}{2}=\left[\dfrac{1}{3}.\dfrac{6}{7}+\dfrac{1}{7}.\dfrac{3}{2}-\dfrac{1}{3}\right]=\dfrac{1}{3}.\dfrac{-1}{7}+\dfrac{1}{7}.\dfrac{3}{2}=\dfrac{1}{7}\left\{\dfrac{-2}{6}+\dfrac{9}{6}\right\}.=\dfrac{1}{6}\)

      bởi Quỳnh Trần 15/12/2018
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    15/12/2018 |   1 Trả lời

  • 6x+x=5^11:5^9+3^1

    15/12/2018 |   1 Trả lời

  • Hai ô tô khởi hành cùng lúc tại A và B đi ngược chiều nhau để gặp nhau. Sau hai giờ hai ô tô còn cách nhau 80km. Biết rằng ô tô thứ hất đi hết quãng đường AB trong 5 giờ, ô tô thứ hai đi hết quãng đường AB trong 6 giờ. Tính quãng đường AB

    15/12/2018 |   2 Trả lời

  • \(\dfrac{2}{3}l\) mật ong nặng\(\dfrac{9}{10}kg\). hỏi cả lít mật ong nặng bao nhiêu kg?

    15/12/2018 |   1 Trả lời

  • -25.72+25.21-49.25

    15/12/2018 |   1 Trả lời

  • Cho \(A=\dfrac{10^8+2}{10^8-1}\)

    15/12/2018 |   1 Trả lời

  • \(25.\left(-12\right)+3.\left(-25\right)-125\)

    giúp mình nhé

    hihi

    15/12/2018 |   1 Trả lời

  • Năm 1990 tuổi bố Nam đúng bằng tổng các chữ số của năm sinh.Hỏi hiện nay (năm 2017) bố Nam bao nhiêu tuổi?

    15/12/2018 |   1 Trả lời

  • Tìm x biết:

    50%x + \(\dfrac{2}{3}\)x = x+4

    15/12/2018 |   1 Trả lời

 

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