(5x^2+6x-7)+[-4x^2-( )] =x^2+2x+1 (x^3-4x^2y+11xy^2-y^3)+()=x^3+3x^2y-5xy^2

2024-12-16 15:18:09
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回答1:

(5x^2+6x-7)+[-4x^2-(4x-8 )] =x^2+2x+1

(x^3-4x^2y+11xy^2-y^3)+(7x^y-16xy^2+y^3)=x^3+3x^2y-5xy^2