解方程 5(10x+30)-2(4x-10)=-250 (3a²-5a+4)—4(-2a²-3a+3)化简
问题描述:
解方程 5(10x+30)-2(4x-10)=-250 (3a²-5a+4)—4(-2a²-3a+3)化简
答
5(10x+30)-2(4x-10)=-25050x+150-8x+20=-25042x=-250-150-20=-420x=-420÷42=-10(3a²-5a+4)—4(-2a²-3a+3)=3a²-5a+4+8a²+12a-12=11a²+7a-8