(x²+3x+2)(x²+7x+12)-120因式分解
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(x²+3x+2)(x²+7x+12)-120因式分解
(x²+3x+2)(x²+7x+12)-120
因式分解
(x²+3x+2)(x²+7x+12)-120因式分解
(x+1)(x+2)(x+3)(x+4)-120
=(x2+5x+4)(x2+5x+6)-120
=(x2+5x)^2+10(x2+5x)-96
=(x2+5x-6)(x2+5x+16)
=(x-1)(x+6)(x2+5x+16)
(x+1)(x+2)(x+3)(x+4)