解方程(x+1)(x²-1)-(x-1)²=(2x+1)(2x-1)
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(x+1)(x²-1)-(x-1)²=(2x+1)(2x-1)
解:(x-1)【(x+1)²-(x-1)】=4x²-1
(x-1)【x²+2x+1-x+1)】=4x²-1
(x-1)【x²+x+2)】=4x²-1
x^3-1^3+x-1=4x²-1
x^3-4x²+x-1=0
x^3-2x²+x-2x²-1=0
x(x-1)²-2x²+2-3=0
(x-1)[x(x-1)-2(x+1)-3]=0
(x-1)=0 [x(x-1)-2(x+1)-3]=0
x1=1
[x²-x-2x-2-3]=0
x²-3x-5=0
x²-3x+9/4-9/4-5=0
(x-3/2)²=29/4
x-3/2=±√29/4
x=3/2±√29/4
解:(x-1)【(x+1)²-(x-1)】=4x²-1
(x-1)【x²+2x+1-x+1)】=4x²-1
(x-1)【x²+x+2)】=4x²-1
x^3-1^3+x-1=4x²-1
x^3-4x²+x-1=0
x^3-2x²+x-2x²-1=0
x(x-1)²-2x²+2-3=0
(x-1)[x(x-1)-2(x+1)-3]=0
(x-1)=0 [x(x-1)-2(x+1)-3]=0
x1=1
[x²-x-2x-2-3]=0
x²-3x-5=0
x²-3x+9/4-9/4-5=0
(x-3/2)²=29/4
x-3/2=±√29/4
x=3/2±√29/4
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