Question

Các bác giải giúp cháu câu 3. Tìm x ạ

4  1/2 ×  X -2 1/2× X =1 1/2

X ×1/2 +X ×1/3=5/6

 

Answer 1

`4 1/2 xx x - 2 1/2 xx x = 1 1/2`

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

`=> (9/2-5/2)xx x=3/2`

`=>4/2xx x=3/2`

`=>x=3/2:4/2`

`=>x=3/2:2`

`=>x=3/2xx1/2`

`=>x=3/4`

Vậy `x=3/4`

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`x xx1/2+x xx1/3=5/6`

`=>x xx(1/2+1/3)=5/6`

`=>x xx(3/6+2/6)=5/6`

`=>x xx5/6=5/6`

`=>x=5/6:5/6`

`=>x=5/6xx6/5`

`=>x=1`