x2-8x+7 x²+7x-18 因式分解
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x2-8x+7 x²+7x-18 因式分解
x2-8x+7 x²+7x-18 因式分解
x2-8x+7 x²+7x-18 因式分解
x²-8x+7
=(x-1)(x-7)
x²+7x-18
=(x+9)(x-2)
x2-8x+7
=(x-1)(x-7)
x²+7x-18
=(x+9(x-2)