已知X的平方加上X加1等于0,求X的立方加上2乘以X的平方加上2乘以X加3的值
人气:408 ℃ 时间:2019-08-19 10:27:02
解答
x^2+x+1=0
x^3+2x^2+2x+3=(x^3+x^2+x)+(x^2+x+1)+2=0+0+2=2
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