急求初一化简求值题500到!急急急急急急急急急急急急急急急!

问题描述:

急求初一化简求值题500到!急急急急急急急急急急急急急急急!
带答案

3.3ab-4ab+8ab-7ab+ab=______. 4.7x-(5x-5y)-y=______. 5.23a3bc2-15ab2c+8abc-24a3bc2-8abc=______. 6.-7x2+6x+13x2-4x-5x2=______. 7.2y+(-2y+5)-(3y+2)=______. 11.(2x2-3xy+4y2)+(x2+2xy-3y2)=_____...