Thực hiện phép tính: b) 2/3 . 2/7 – 2/3 . 3/7 + 8/7 . 2/3 c) -3/5 + 7/13 + -2/5 + -23/25 + 6/13 d) ( 1/3 + 3/4 – 13/12 ) : ( 12/23 + 123/234 + 1234/23

Question

Thực hiện phép tính:
b) 2/3 . 2/7 – 2/3 . 3/7 + 8/7 . 2/3
c) -3/5 + 7/13 + -2/5 + -23/25 + 6/13
d) ( 1/3 + 3/4 – 13/12 ) : ( 12/23 + 123/234 + 1234/2345 )

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aikhanh 3 tuần 2021-08-13T13:20:25+00:00 1 Answers 0 views 0

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    2021-08-13T13:22:08+00:00

    Đáp án:

    b) 2/3 . 2/7 – 2/3 . 3/7 + 8/7 . 2/3 

    = 2.3x(2/7-3/7+8/7)

     = 15/7 

    c) -3/5 + 7/13 + -2/5 + -23/25 + 6/13  

    = [(-3/5) +(-2/5)+ (-23/25) ] + ( 7/13+6/13) 

     = 18/25 + 1

    =1 

    d) ( 1/3 + 3/4 – 13/12 ) : ( 12/23 + 123/234 + 1234/2345 )

    = (4/12 + 9/12-13/12)   : ( 12/23 + 123/234 + 1234/2345 )

    = (4+9-13 /12)  : ( 12/23 + 123/234 + 1234/2345 )

    =0 : ( 12/23 + 123/234 + 1234/2345 )

    = 0 

    ———————————–shune moon ❤——————————————–

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