(1)x²y-2xy+y (2)-(x-1）²+9 (3)2ax²+4axy+2ay

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(1)x²y-2xy+y (2)-(x-1）²+9 (3)2ax²+4axy+2ay² （4）ay²+ay+1/4a

(1)=y(x^2-2x+1)
=y(x-1)^2
(2)= -(x^2+1+2x)+9
= -x^2+8+2x
= -(x^2-8-2x)
= -(x-4)(x+2)=（x-4)(x+2)
(3)=2a(x^2+2xy+y^2)
=2a(x+y)^2
(4)=a(y^2+y+1/4)
=a(y+1/2)^2
“ ^2 ”表示表示平方,不知道你多大,注明一下.
另外这种题不算难,还是多做一些数学题吧,免得到时候考试有问题哦

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