Đáp án+Giải thích các bước giải:

 Bài `10:`

`1)`

`2,7.x+4,3.x-1,25=93.0,25`

`=>x.(2,7+4,3)-1,25=23,25`

`=>x.7=23,25+1,25`

`=>x.7=24,5`

`=>x=24,5:7`

`=>x=3,5`

Vậy `x=3,5`

`2)`

`2,14.x+3,12-5,12.x+7,14=2,555.0,4`

`=>x.(2,14-5,12)+(3,12+7,14)=1,022`

`=>x.(-2,98)+10,26=1,022`

`=>x.(-2,98)=1,022-10,26`

`=>x.(-2,98)=(-9,238)`

`=>x=(-9,238):(-2,98)`

`=>x=3,1`

Vậy `x=3,1`

`3)`

`5,13.(2.x+1)+2.x.6,17=52,59`

`=>5,13.2x+5,13+x.(2.6,17)=52,59`

`=>10,26.x+5,13+x.12,34=52,59`

`=>x.(10,26+12,34)=52,59-5,13`

`=>x.22,6=47,46`

`=>x=47,46:22,6`

`=>x=2,1`

Vậy `x=2,1`

`5)`

`x.(5,14+2,14)-x.(5,12.2,8)=(-42,336)`

`=>x.(5,14+2,14-5,12.2,8)=(-42,336)`

`=>x.(7,28-14,336)=(-42,336)`

`=>x.(-7,056)=(-42,336)`

`=>x=(-42,336):(-7,056)`

`=>x=6`

Vậy `x=6`

`7)`

`5,13-6,1.x+3,21+1,12.x=(-2,118)`

`=>x.(1,12-6,1)+(5,13+3,21)=(-2,118)`

`=>x.(-4,98)+8,34=-2,118`

`=>x.(-4,98)=-2,118-8,34`

`=>x.(-4,98)=-10,458`

`=>x=(-10,458):(-4,98)`

`=>x=2,1`

Vậy `x=2,1`

`9)`

`3,2.x-6,14.(5,2-2,1.x)=1,8694`

`=>3,2.x-6,14.5,2+6,14.2,1x=1,8694`

`=>x.(3,2+6,14.2,1)-31,928=1,8694`

`=>x.(3,2+12,894)=1,8694+31,928`

`=>x.16,094=33,7974`

`=>x=33,7974:16,094`

`=>x=2,1`

Vậy `x=2,1`