Đáp án+Giải thích các bước giải:

 `10)\frac{x^{2}}{2}+7/2x^{2}+x`

`=(1/2x^{2}+7/2x^{2})+x`

`=8/2x^{2}+x`

`=4x^{2}+x`

`11)2x^{3}+3x^{3}-1/3x^{3}`

`=5x^{3}-1/3x^{3}`

`=15/3x^{3}-1/3x^{3}`

`=14/3x^{3}`

`12)5xy^{2}+1/2xy^{2}+1/4xy^{2}`

`=20/4xy^{2}+2/4xy^{2}+1/4xy^{2}`

`=23/4xy^{2}`

`13)1/2x^{2}+1/3x^{3}-5/2x^{2}-7/3x^{3}`

`=(1/2x^{2}-5/2x^{2})+(1/3x^{3}-7/3x^{3})`

`=(-4/2x^{2})+(-6/3x^{3})`

`=-2x^{2}-2x^{3}`

`14)3/4xyz^{2}+2/4xyz^{2}+1/4xyz^{2}`

`=6/4xyz^{2}`

`=3/2xyz^{2}`

`15)5/8x^{2}y^{3}+1/2y^{3}x^{2}-3x^{2}y^{3}`

`=5/8x^{2}y^{3}+1/2x^{2}y^{3}-3x^{2}y^{3}`

`=5/8x^{2}y^{3}+4/8x^{2}y^{3}-24/8x^{2}y^{2}`

`=-15/8x^{2}y^{3}`