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数学
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Ё求解一道方程,x^2-4(1-2x)^2+x+3(1-2x) =1
人气:367 ℃ 时间:2020-01-31 11:23:55
解答
x^2-4(4x^2-4x+1)+x+3-6x=1
15x^2-11x+2=0
b^2-4ac=121-4*15*2=1
x=(11±1)/30=2/5 or 1/3
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