数学初二因式分解
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(1)原式=[5(x+y)+2(x-y)][5(x+y)-2(x-y)]
=(5x+5y+2x-2y)(5x+5y-2x+2y)
=(7x+3y)(3x+7y)
(2)原式=[(a²+4b²)+4ab][(a²+4b²-4ab)
=(a²+4ab+4b²)(a²-4ab+4b²)
=(a+2b)²(a-2b)²
(3)原式=(x²-6x+9)-y²
=(x-3)²-y²
=(x-3+y)(x-3-y)
=(5x+5y+2x-2y)(5x+5y-2x+2y)
=(7x+3y)(3x+7y)
(2)原式=[(a²+4b²)+4ab][(a²+4b²-4ab)
=(a²+4ab+4b²)(a²-4ab+4b²)
=(a+2b)²(a-2b)²
(3)原式=(x²-6x+9)-y²
=(x-3)²-y²
=(x-3+y)(x-3-y)
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