(x+y)(x+y)-x(x+y)急啊啊啊啊,

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(x+y)(x+y)-x(x+y)急啊啊啊啊,(x+y)(x+y)-x(x+y)急啊啊啊啊,(x+y)(x+y)-x(x+y)急啊啊啊啊,(x+y)(x+y)-x(x+y)=[(x+y)-x](x+y

(x+y)(x+y)-x(x+y)急啊啊啊啊,
(x+y)(x+y)-x(x+y)急啊啊啊啊,

(x+y)(x+y)-x(x+y)急啊啊啊啊,
(x+y)(x+y)-x(x+y)
=[(x+y)-x](x+y)
=y(x+y)

=5x*x+10x*y+5y*y-x*x-x*y=4x*x+9x*y+5y*y
话说你是几年级的??

同时提取(x+y) 啊
(x+y)(x+y)-x(x+y)
=(x+y)[(x+y)-x]
=y(x+y)