Question

Resolva a edição e subtração dos monômios?
5xy+2x^2+3x^2-7xy-4x^2


2x^4-x^2+7x^2-4x^4+3x^2


2w^2k+7w^2k-w^2k+3w^2k

Answer 1

a) 

$5xy+2x^2+3x^2-7xy-4x^2\\\left(2x^2+3x^2-4x^2\right)+\left(5xy-7xy\right)\\x^2\left(2+3-4\right)+xy\left(5-7\right)\\x^2+xy\cdot \left(-2\right)\\\boxed{\bold{x^2-2xy}}$

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b)

$2x^4-x^2+7x^2-4x^4+3x^2\\\left(2x^4-4x^4\right)+\left(7x^2-x^2+3x^2\right)\\x^4\left(2-4\right)+x^2\left(7-1+3\right)\\x^4\cdot \left(-2\right)+x^2\cdot 9\\\boxed{\bold{-2x^4+9x^2}}$

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c)

$2w^2k+7w^2k-w^2k+3w^2k\\w^2k\cdot \left(2+7-1+3\right)\\w^2k\cdot \left(9+2\right)\\w^2k\cdot 11\\\boxed{\bold{11w^2k}}$