因式分解(x²+x-1)(x²x-7)+5 -3x^(n+2)+18x^(n+1)y-27x^ny² (a-b)x²+2ax+a+b
人气:262 ℃ 时间:2020-01-31 02:08:40
解答
(x²+x-1)(x²+x-7)+5=(x²+x)²-8(x²+x)+12=(x²+x-2)(x²+x-6)=(x+2)(x-1)(x+3)(x-2)-3x^(n+2)+18x^(n+1)y-27x^ny² =-3x^n(x^2-6xy+9y^2)=-3x^n(x-3y)^2(a-b)x&s...
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