解方程:(2x+1)(2x-1)+3(x+2)(x-2)=(7x+1)(x-1)要过程喔~~
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解方程:(2x+1)(2x-1)+3(x+2)(x-2)=(7x+1)(x-1)要过程喔~~
解方程:(2x+1)(2x-1)+3(x+2)(x-2)=(7x+1)(x-1)要过程喔~~
解方程:(2x+1)(2x-1)+3(x+2)(x-2)=(7x+1)(x-1)要过程喔~~
(2x+1)(2x-1)+3(x+2)(x-2)=(7x+1)(x-1)
4x^2-1+3x^2-12=7x^2+x-7x-1
13=6x+1
x=2
(2x+1)(2x-1)+3(x+2)(x-2)=(7x+1)(x-1)
2x²-1+3(x²-4)=7x²+x-7x-1
2x²-1+3x²-12=7x²-6x-1
5x²-13=7x²-6x-1
2x²-6x-12=0
x²-3x-6=0
x²-3x+9/4=6-9/4=15/4
(x-3/2)²=15/4
x-3/2=±1/2√15
x=3/2±1/2√15