(x+y),(x+y) 等于多少啊?
1个回答
(x+y) =x+y+3xy+3xy 可以这样来思考:(x+y)=(x+y)(x+y) =(x+y+2xy)(x+y) =x+xy+yx+y+2xy+2xy =x+y+3xy+3xy
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