(y-7)²=12 25(2x-1)²-16=0 2x²+1=3x OK?
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![(y-7)²=12 25(2x-1)²-16=0 2x²+1=3x OK?](/uploads/image/z/3776447-47-7.jpg?t=%28y-7%29%26%23178%3B%3D12+25%282x-1%29%26%23178%3B-16%3D0+2x%26%23178%3B%2B1%3D3x+OK%3F)
(y-7)²=12 25(2x-1)²-16=0 2x²+1=3x OK?
(y-7)²=12 25(2x-1)²-16=0 2x²+1=3x OK?
(y-7)²=12 25(2x-1)²-16=0 2x²+1=3x OK?
(1)
y-7=±√12=±2√3
y=7±2√3
(2)
25(2x-1)^2=16
(10x-5)^2=16
10x-5=±√16=±4
10x=5±4
x=(5±4)/10
或者说x=0.1或x=0.9
(3)2x^2-3x+1=0
(x-1)(2x-1)=0
x-1=0或2x-1=0
x=1或x=1/2