Question

化简整式两题(1)7ab-3a^2b^2+7+8ab^2+3a^2b^2-3-7ab(2)3x^3-3x^2-y^2+5

Answer 1

7ab-3a^2b^2+7+8ab^2+3a^2b^2-3-7ab =(7ab-7ab)+(-3a^2b^2+3a^2b^2)+7-3=4 3x^3-3x^2-y^2+5y+x^2-5y+y^2 = 3x^3+(-3x^2+x^2)+(5y-5y)+(-y^2+y^2 )=3x^3-2x^2