初三解一元二次方程.1.4x²-3x-1=0(用配方法)2.5x²-√(5x)-6=0(精确到0.1)3.(2x-1)²-7=3(x+1)4.(x²-3)²-3(3-x²)+2=0
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![初三解一元二次方程.1.4x²-3x-1=0(用配方法)2.5x²-√(5x)-6=0(精确到0.1)3.(2x-1)²-7=3(x+1)4.(x²-3)²-3(3-x²)+2=0](/uploads/image/z/13427623-55-3.jpg?t=%E5%88%9D%E4%B8%89%E8%A7%A3%E4%B8%80%E5%85%83%E4%BA%8C%E6%AC%A1%E6%96%B9%E7%A8%8B.1.4x%26%23178%3B-3x-1%3D0%EF%BC%88%E7%94%A8%E9%85%8D%E6%96%B9%E6%B3%95%EF%BC%892.5x%26%23178%3B-%E2%88%9A%EF%BC%885x%EF%BC%89-6%3D0%EF%BC%88%E7%B2%BE%E7%A1%AE%E5%88%B00.1%EF%BC%893.%EF%BC%882x-1%EF%BC%89%26%23178%3B-7%3D3%EF%BC%88x%2B1%EF%BC%894.%EF%BC%88x%26%23178%3B-3%EF%BC%89%26%23178%3B-3%EF%BC%883-x%26%23178%3B%EF%BC%89%2B2%3D0)
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初三解一元二次方程.1.4x²-3x-1=0(用配方法)2.5x²-√(5x)-6=0(精确到0.1)3.(2x-1)²-7=3(x+1)4.(x²-3)²-3(3-x²)+2=0
初三解一元二次方程.
1.4x²-3x-1=0(用配方法)
2.5x²-√(5x)-6=0(精确到0.1)
3.(2x-1)²-7=3(x+1)
4.(x²-3)²-3(3-x²)+2=0
初三解一元二次方程.1.4x²-3x-1=0(用配方法)2.5x²-√(5x)-6=0(精确到0.1)3.(2x-1)²-7=3(x+1)4.(x²-3)²-3(3-x²)+2=0
1.4x²-3x-1=0(用配方法)
4(x²-2*3/8x+9/64-9/64)-1=0
4(x-3/8)²-9/16-1=0
2(x-3/8)=±5/4
x-3/8=±5/8
x=1或x=-1/4
2.5x²-√(5x)-6=0(精确到0.1)
(√5x)²-(√5x)-6=0
(√5x-3)(√5x+2)=0
√5x-3=0或√5x+2=0
x=3√5/5或x=-2√5/5
x≈1.3或x≈-0.9
3.(2x-1)²-7=3(x+1)
4x²-4x+1-7-3x-3=0
4x²-7x-9=0
4(x²-2*7/8x+49/64-49/64)-9=0
4(x-7/8)²-193/16=0
2(x-7/8)=±√193/4
x=(7±√193)/8
4.(x²-3)²-3(3-x²)+2=0
(x²-3)²+3(x²-3)+2=0
(x²-3+2)(x²-3+1)=0
x²=1或x²=2
x=±1或x=±√2