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Đáp án:+Giải thích các bước giải:

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`b)-(-4/9+3/7)+(1 3/7+5/9-0,75)`

`=4/9-3/7+1 3/7+5/9-3/4`

`=(4/9+5/9)+(1 3/7-3/7)-3/4`

`=1+1-3/4=2-3/4=5/4`

`d)55/27+(-21)/5+(-55)/27-(-21)/5`

`=55/27-21/5-55/27+21/5`

`=(55/27-55/27)+(21/5-21/5)`

`=0+0=0`

`e)(2+1/3-2/5)-(7-3/5-4/3)-(1/5+5/3-4)`

`=2+1/3-2/5-7+3/5+4/3-1/5-5/3+4`

`=(2-7+4)+(1/3+4/3-5/3)-(2/5+1/5-3/5)`

`=(-1)+0-0`

`=-1`