解方程.求大神进~~~~~~~~~~~~X2-3X-1=(X²-3X)分之12
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解方程.求大神进~~~~~~~~~~~~X2-3X-1=(X²-3X)分之12
解方程.求大神进~~~~~~~~~~~~
X2-3X-1=(X²-3X)分之12
解方程.求大神进~~~~~~~~~~~~X2-3X-1=(X²-3X)分之12
令X2-3x=t 所以原试可化为t2-t-12=0 得t=4 或-3 当t=4时 X2-3x=4 得x=4或 -1
当t=-3 即X2-3x=-3此方程无解 所以原方程的解为x=4或 -1
设X²-3X=Y,整理原式有(Y-4)(Y+3)=0,所以Y=4或者Y=-3,那么X²-3X=4或X²-3X=-3(无解),解出X=4,X=-1,
设X²-3X=Y,整理原式有(Y-4)(Y+3)=0,所以Y=4或者Y=-3,那么X²-3X=4或X²-3X=-3(无解),解出X=4,X=-1,