⑴9(x-y)²-25 ⑵(x²-y)²-(2y-2)² ⑶(a²-2b)²-(1-2b
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⑴9(x-y)²-25⑵(x²-y)²-(2y-2)²⑶(a²-2b)²-(1-2b⑴9(x-y)²-25⑵(x²-y)
⑴9(x-y)²-25 ⑵(x²-y)²-(2y-2)² ⑶(a²-2b)²-(1-2b
⑴9(x-y)²-25 ⑵(x²-y)²-(2y-2)² ⑶(a²-2b)²-(1-2b
⑴9(x-y)²-25 ⑵(x²-y)²-(2y-2)² ⑶(a²-2b)²-(1-2b
⑴9(x-y)2-25=(3x-3y+5)(3x-3y-5)
⑵(x2-y)2-(2y-2)2=(x2-y+2y-2)(x2-y-2y+2)=(x2+y-2)(x2-3y+2)
⑶(a2-2b)2-(1-2b)2=(a2-2b+1-2b)(a2-2b-1+2b)=(a2-4b+1)(a2-1)=(a2-4b+1)(a-1)(a+1)
⑴ 9(x-y)²-25
=[3(x-y)+5][3(x-y)-5]
=[3x-3y+5][3x-3y-5]
⑵(x²-y)²-(2y-2)²
=(x^2-y+2y-2)(x^2-y-2y+2)
=(x^2+y-2)(x^2-3y+2)
⑶(a²-2b)²-(1-2b)²
=(a^2-2b+1-2b)(a^2-2b-1+2b)
=(a^2-4b+1)(a+1)(a-1)
⑴9(x-y)²-25 ⑵(x²-y)²-(2y-2)² ⑶(a²-2b)²-(1-2b
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