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数学
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2x(x^2+9)=20x^2
人气:480 ℃ 时间:2020-04-10 20:42:26
解答
2x(x^2+9)=20x^2
2x^3+18x-20X^2=0
x^3-10x^2+9x=0
x(x^2-10x+9)=0
x(x-1)(x-9)=0
x1=0 x2=1 x3=9
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