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

0 bình luận về “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”

1. 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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