1.(x+2)²-5=0 2.2x²-x-3=0 3.x²-6x-5=0 4.(x+3)²=2x+6 运用一元二次方程的方法解
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![1.(x+2)²-5=0 2.2x²-x-3=0 3.x²-6x-5=0 4.(x+3)²=2x+6 运用一元二次方程的方法解](/uploads/image/z/577862-62-2.jpg?t=1.%EF%BC%88x%2B2%29%26%23178%3B-5%3D0+2.2x%26%23178%3B-x-3%3D0+3.x%26%23178%3B-6x-5%3D0+4.%28x%2B3%29%26%23178%3B%3D2x%2B6+%E8%BF%90%E7%94%A8%E4%B8%80%E5%85%83%E4%BA%8C%E6%AC%A1%E6%96%B9%E7%A8%8B%E7%9A%84%E6%96%B9%E6%B3%95%E8%A7%A3)
1.(x+2)²-5=0 2.2x²-x-3=0 3.x²-6x-5=0 4.(x+3)²=2x+6 运用一元二次方程的方法解
1.(x+2)²-5=0 2.2x²-x-3=0 3.x²-6x-5=0 4.(x+3)²=2x+6 运用一元二次方程的方法解
1.(x+2)²-5=0 2.2x²-x-3=0 3.x²-6x-5=0 4.(x+3)²=2x+6 运用一元二次方程的方法解
(1)x+2=±5
x=-2±5
(2)(x+1)(2x-3)=0
x=-1或3/2
(3)x={6±√[6^2-4x(-5)]}/2
=(6±√56)/2
=3±√14
(4)(x+3)²=2(x+3)
(x+3)²-2(x+3)=0
(x+3)(x+3-2)=0
(x+3)(x+1)=0
x=-3或-1