海露滴眼液怎么关:数学计算题(追加赏分)
来源:百度文库 编辑:神马品牌网 时间:2024/10/06 23:52:25
(1) 2x-2y+3xy(x-y)
(2) 5(a+b)(y-x)-2a(a+b)(x-y)
(2) 5(a+b)(y-x)-2a(a+b)(x-y)
2x-2y+3xy(x-y)
=2(x-y)+3xy(x-y)
=(2+3xy)(x-y)
5(a+b)(y-x)-2a(a+b)(x-y)
=5(a+b)(y-x)+2a(a+b)(y-x)
=(5+2a)(a+b)(y-x)
2x-2y+3xy(x-y)
=2(x-y)+3xy(x-y)
=(2+3xy)(x-y)
5(a+b)(y-x)-2a(a+b)(x-y)
=5(a+b)(y-x)+2a(a+b)(y-x)
=(5+2a)(a+b)(y-x)
好象是初中的水平,这个也求且有人来答.真郁闷!~-~
1'(2+3xy)(x-y)
2 (5+2a)(a+b)(y-x)