化简(1)-7mn+mn+5nm (2)(2-m2+4m)-(5m2一m-1)
题型:计算题
问题:
化简(1)-7mn+mn+5nm
(2)(2-m2+4m)-(5m2一m-1)
(3)(-3a2-2a)-[a2-2(5a-4a2+1)-3a]
(4)5x2-(3y2+7xy)+2(2y2-5x2)
化简(1)-7mn+mn+5nm
(2)(2-m2+4m)-(5m2一m-1)
(3)(-3a2-2a)-[a2-2(5a-4a2+1)-3a]
(4)5x2-(3y2+7xy)+2(2y2-5x2)