3x-1.56=25.2解方程(解方程a2)(1)

这道方程配方法解方程有些特珠。

分析:a-1≠0,a≠1,a≠0

解:原方程做如下变形:

[a^2(a-1)^2 a^3]/(a-1)^2=6

(a^4-2a^3 a^2 a^3)/(a-1)^2=6

(a^4-a^3 a^2)/(a-1)^2=6

a^4/(a-1)^2-(a^3-a^2)/(a-1)^2=6

[a^2/(a-1)]^2-a^2(a-1)/(a-1)^2=6

∴[a^2/(a-1)]^2-[a^2/(a-1)]-6=0

∴[a^2/(a-1)-3][a^2/(a-1) 2]=0

∴有a^2/(a-1)-3=0或a^2/(a-1) 2=0

当a^2/(a-1)-3=0时,a^2-3a 3=0,△<0,无实根

当a^2/(a-1) 2=0时,a^2 2a-2=0

a=-1 √3或a=-1-√3

∴原方程的解为:a1=-1 √3,a2=-1-√3

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