a, x-5,14=(15,7+2,3).2 b, 1/2.x+ 3/4= -3/10 c., 2/3+ 1/3: x= 2/5 d, x-5/9 = -2/3

Đáp án:

Giải thích các bước giải:

`a)` `x-5,14=(15,7+2,3).2`

`=>x-5,14=18.2`

`=>x-5,14=36`

`=>x=36+5,14`

`=>x=41,14`

Vậy `x=41,14`

`b)` `1/2 .x+3/4={-3}/10`

`=>1/2 x={-3}/10-3/4`

`=>1/2 x=-21/20`

`=>x=-21/20:1/2`

`=>x=-21/20. 2/1`

`=>x=-21/10`

Vậy `x=-21/10`

`c)` `2/3+1/3:x=2/5`

`=>1/3:x=2/5-2/3`

`=>1/3:x=-4/15`

`=>x=1/3:(-4/15)`

`=>x=-5/4`

`d)` `x-5/9=-2/3`

`=>x=-2/3+5/9`

`=>x=-1/9`

Vayaj`x=-1/9`

Vậy `x=-5/4`