题目内容：

初一的整式的加减题
(1) 4（a²-2ab)-3(ab-b²)+5(2a²-3b²)
(2) -7x²+(6x²-5xy)-2(3y²+xy-x²)
(3) 3(5m-6n)+2(3m-4n)
(4) 5(a²b-2ab²+c)-4(2c+3a²b-ab²)

优质解答

(1)=4a^2-8ab-3ab+3b^2+10a^2-15b^2
=14a^2-11ab-12b^2
(2)=-7x^2+6x^2-5xy-6y^2-2xy+2x^2
=x^2-7xy-6y^2
(3)=15m-18n+6m-8n
=21m-26n
(4)=5a^2b-10ab^2+5c-8c-12a^2b+4ab^2
=-7a^2b-6ab^2-3c