Question

c. x+1/2 x 1/3 bằng 3/4 

a.6/7 + 7/8                    b.4/5 - 2/3                          c.2/3 x 4/9                        d.1/5 : 2/7

a.13/15 +4/7 - 101/105                         b.2/5 +3/5 x 4/9               c 3/4 x5/2 x 7/6

d. 1/2 : 1/4 - 1/6                      e. 2/3 -1/4 + 2/9            g. 5/2 + 1/3 x 3/2

Answer 1

`x + 1/2 xx 1/3=3/4`

`x+1/6=3/4`

`x=3/4-1/6`

`x=9/12-2/12`

`x=7/12`

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`6/7+7/8`

`=48/56 + 49/56`

`=97/56`

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`4/5-2/3`

`=12/15-10/15`

`=2/15`

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`2/3 xx 4/9`

`=(2xx4)/(3xx9)`

`=8/27`

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`1/5:2/7`

`=1/5 . 7/2`

`=(1xx7)/(5xx2)`

`=7/10`

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`13/15 +4/7-101/105`

`=91/105 + 60/105 - 101/105`

`=(91+60-101)/105`

`=50/105`

`=10/21`

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`2/5+3/5 xx 4/9`

`=2/5 + 4/15`

`=6/15+4/15`

`=10/15`

`=2/3`

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`3/4xx5/2xx7/6`

`=(3xx5xx7)/(4xx2xx6)`

`=35/16`

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`1/2:1/4 - 1/6`

`=1/2 xx 4 - 1/6`

`=2-1/6`

`=12/6 - 1/6`

`=11/6`

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`2/3-1/4 +2/9`

`=5/12 +2/9`

`=15/36 + 8/36`

`=23/36`

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`5/2+1/3 xx 3/2`

`=5/2 + 1/2`

`=6/2`

`=3`

Answer 2

a: =48/56+49/56=97/56

b: =12/15-10/15=2/15

c: =8/27

d =1/5x7/2=7/10