aˆ2-4a+4 (x-y)ˆ2-4(x-y-1)因式分解aˆ2-4a+4 和(x-y)ˆ2-4(x-y-1)因式分解

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aˆ2-4a+4 (x-y)ˆ2-4(x-y-1)因式分解aˆ2-4a+4 和(x-y)ˆ2-4(x-y-1)因式分解

aˆ2-4a+4 (x-y)ˆ2-4(x-y-1)因式分解aˆ2-4a+4 和(x-y)ˆ2-4(x-y-1)因式分解
aˆ2-4a+4 (x-y)ˆ2-4(x-y-1)因式分解
aˆ2-4a+4 和(x-y)ˆ2-4(x-y-1)因式分解

aˆ2-4a+4 (x-y)ˆ2-4(x-y-1)因式分解aˆ2-4a+4 和(x-y)ˆ2-4(x-y-1)因式分解
aˆ2-4a+4 =(a-2)^2

(x-y)ˆ2-4(x-y-1)
=(x-y)^2-4(x-y)+4
=(x-y-2)^2