已知X平方+2X-5=0 則(X-1)(X-2)(X+3)(X+4)
求解!!!!?
回答 (1)
Sol
x^2+2x-5=0
x^2+2x=5
(x-1)(x-2)(x+3)(x+4)
=(x-1)(x+3)(x-2)(x+4)
=(x^2+2x-3)(x^2+2x-8)
=(5-3)*(5-8)
=-6
收錄日期: 2021-04-30 21:53:05
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