Tìm X

A) X:2,2=(18,6-12,3):3

B)3/8-1/6X=1/4

C)X/5=2/3

D) 1/2-2/3X=7/12

E) X/5+1/2=6/10

F)X+3/15=1/3

G)X-12/4=1/2

Đáp án`+`Giải thích các bước giải :

`a)x:2,2=(18,6-12,3):3`

`<=>x:2,2=6,3:3`

`<=>x:2,2=2,1`

`<=>x=2,1.2,2`

`<=>x=4,62`

Vậy `x=4,62`

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`b)3/8-1/6 x=1/4`

`<=>1/6 x=3/8-1/4`

`<=>1/6 x=1/8`

`<=>x=1/8:1/6`

`<=>=3/4`

Vậy `x=3/4`

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`c)x/5=2/3`

`<=>3x=2.5`

`<=>3x=10`

`<=>x=10/3`

Vậy `x=10/3`

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`d)1/2-2/3 x=7/12`

`<=>2/3 x=1/2-7/12`

`<=>2/3 x=-1/12`

`<=>x=-1/12:2/3`

`<=>x=-1/8`\

Vậy `x=-1/8`

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`e)x/5+1/2=6/10`

`<=>x/5=6/10-1/2`

`<=>x/5=1/10`

`<=>10x=5`

`<=>x=1/2`

Vậy `x=1/2`

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`f)x+3/15=1/3`

`<=>x=1/3-3/15`

`<=>x=2/15`

Vậy `x=2/15`

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`g)x-12/4=1/2`

`<=>x=1/2+12/4`

`<=>x=7/2`

Vậy `x=7/2`