用适当的方法解方程(3x-1)²=(2x+1)²(2)x²+8x+16=7(3)x²+x-2=0
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![用适当的方法解方程(3x-1)²=(2x+1)²(2)x²+8x+16=7(3)x²+x-2=0](/uploads/image/z/583621-61-1.jpg?t=%E7%94%A8%E9%80%82%E5%BD%93%E7%9A%84%E6%96%B9%E6%B3%95%E8%A7%A3%E6%96%B9%E7%A8%8B%EF%BC%883x-1%EF%BC%89%26%23178%3B%3D%EF%BC%882x%2B1%EF%BC%89%26%23178%3B%EF%BC%882%EF%BC%89x%26%23178%3B%2B8x%2B16%3D7%EF%BC%883%EF%BC%89x%26%23178%3B%2Bx-2%3D0)
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用适当的方法解方程(3x-1)²=(2x+1)²(2)x²+8x+16=7(3)x²+x-2=0
用适当的方法解方程(3x-1)²=(2x+1)²(2)x²+8x+16=7(3)x²+x-2=0
用适当的方法解方程(3x-1)²=(2x+1)²(2)x²+8x+16=7(3)x²+x-2=0
(3x-1)²=(2x+1)²
(3x-1)²-(2x+1)²=0
(3x-1+2x+1)(3x-1-2x-1)=0
5x(x-2)=0
x=0或x=2
(2)x²+8x+16=7
(x+4)²=7
x+4=±根号7
x=-4+根号7或x=-4-根号7
(3)x²+x-2=0
(x-1)(x+2)=0
x=1或x=-2