Đáp án:

Giải thích các bước giải:

`a)(x^5 -2x^2y^2 z+y^5) +(x^5 +5x^2y^2z-y^5)`

`=x^5 -2x^2y^2z+y^5 + x^5 +5x^2y^2z-y^5`

`=(x^5+x^5)+(-2x^2y^2z+5x^2y^2z)+(y^5-y^5)`

`=2x^5 +3x^2y^2z`

`b)(1/3 ab -6a^3b +2/5 b^5) +(2/3 ab +6a^3b +1/5b^5+7)`

`=1/3 ab-6a^3b +2/5b^5 + 2/3ab+6a^3b +1/5b^5+7`

`=(1/3ab+2/3ab)+(-6a^3b+6a^3b)+(2/5 b^5 +1/5b^5)+7`

`=ab + 3/5b^5+7`

`c)(2,5x^2y +xy^2 +xy^5 z+5)-(0,5 x^2y  +3xy^2 + xy^5 z+9-x)`

`=2,5x^2y + xy^2+xy^5 z+5-0,5x^2y -3xy^2 -xy^5z-9+x`

`=(2,5x^2y -0,5x^2y)+(xy^2-3xy^2)+(xy^5z-xy^5z)+(5-9)+x`

`=2x^2y - 2xy^2 - 4+x`

`d)(4x^3 -3x^2y^2 +y^5)-(x^3 +4x^2y^2+y^5-5)`

`=4x^3-3x^2y^2+y^5 - x^3-4x^2y^2-y^5+5`

`=(4x^3-x^3)+(-3x^2y^2-4x^2y^2)+(y^5-y^5)+5`

`=3x^3 -7x^2y^2+5`