Đáp án:

Giải thích các bước giải:

 Ta có:

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

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

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

`=(-4/4+5/5). 7/3`

`=(-1+1). 7/3`

`=0. 7/3`

`=0`

`e)11/8 . [(-5/11 : 13/8- 8/11 : 13/5)+ -6/33]+(-3)/4`

`=11/8 . [(-5/11 .8/13- 5/11 .5/13)+ -6/33]+(-3)/4`

`=11/8 . {[-5/11 .( 8/13+ 5/13)]+ -6/33}+(-3)/4`

`=11/8 . {[-5/11 .1]+ -6/33}+(-3)/4`

`=11/8 . {-5/11+ -6/33}+(-3)/4`

`=11/8 . {-15/33+ -6/33}+(-3)/4`

`=11/8 . (-21)/33+(-3)/4`

`=11/8 . (-7)/11+(-3)/4`

`=-7/8-3/4`

`=-7/8 - 6/8`

`=-13/8`