Đáp án:
Giải thích các bước giải:
`a`) `(12/32+5/20-10/24):2/3`
`=(5/8-10/24):2/3`
`=5/24:2/3`
`= 5/16`
`b`) `4``.``1/2``.``(2,5-3.``3/4)+``(-1/2)`
`=2.0,25+``-1/2`
`=2.``1/4``+(-1/2)`
`=1/2+``-1/2`
`=0`
`2.` tìm `x`
`a`)`-0,6x-7/3=5,4`
`-0,6x=5,4+7/3`
`-0,6x=7``11/15`
`-0,6x=116/15`
`x=116/15:-0,6`
`x=116/9`
`b`)`2,8.(1/5-3x)=1.2/5`
`1/5-3x=2/5:14/5`
`1/5-3x=1/7`
`3x=1/5-1/7`
`3x=2/35`
`x=2/105`