(x-y)²+4(x-y)+3
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(x-y)²+4(x-y)+3(x-y)²+4(x-y)+3(x-y)²+4(x-y)+3：(x-y)²+4(x-y)+3=（x-y+2)²-1=(x
(x-y)²+4(x-y)+3
(x-y)²+4(x-y)+3
(x-y)²+4(x-y)+3
：(x-y)²+4(x-y)+3=（x-y+2)²-1=(x-y+1)(x-y+3)
(x-y)²+4(x-y)+3
=(x-y+3)(x-y+1)