用公式法解1.-½x²-3x+2=0 2.2x²-2√2x-3=0利用提公因式解:1.x²=4x 2.﹙x-2﹚²+2x(x-2)=0 3.(2x-1)²-4x+2=0利用平方差公式解:1.y²-(2y-1)²=02.(x-1)²=4(x+2)²
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![用公式法解1.-½x²-3x+2=0 2.2x²-2√2x-3=0利用提公因式解:1.x²=4x 2.﹙x-2﹚²+2x(x-2)=0 3.(2x-1)²-4x+2=0利用平方差公式解:1.y²-(2y-1)²=02.(x-1)²=4(x+2)²](/uploads/image/z/1786398-6-8.jpg?t=%E7%94%A8%E5%85%AC%E5%BC%8F%E6%B3%95%E8%A7%A31.-%26%23189%3Bx%26%23178%3B%EF%BC%8D3x%EF%BC%8B2%3D0+2.2x%26%23178%3B%EF%BC%8D2%E2%88%9A2x%EF%BC%8D3%3D0%E5%88%A9%E7%94%A8%E6%8F%90%E5%85%AC%E5%9B%A0%E5%BC%8F%E8%A7%A3%EF%BC%9A1.x%26%23178%3B%3D4x+2.%EF%B9%99x-2%EF%B9%9A%26%23178%3B%2B2x%28x-2%29%3D0+3.%282x-1%29%26%23178%3B-4x%2B2%3D0%E5%88%A9%E7%94%A8%E5%B9%B3%E6%96%B9%E5%B7%AE%E5%85%AC%E5%BC%8F%E8%A7%A3%EF%BC%9A1.y%26%23178%3B-%282y-1%29%26%23178%3B%3D02.%EF%BC%88x-1%29%26%23178%3B%3D4%28x%2B2%29%26%23178%3B)
用公式法解1.-½x²-3x+2=0 2.2x²-2√2x-3=0利用提公因式解:1.x²=4x 2.﹙x-2﹚²+2x(x-2)=0 3.(2x-1)²-4x+2=0利用平方差公式解:1.y²-(2y-1)²=02.(x-1)²=4(x+2)²
用公式法解1.-½x²-3x+2=0 2.2x²-2√2x-3=0
利用提公因式解:1.x²=4x 2.﹙x-2﹚²+2x(x-2)=0 3.(2x-1)²-4x+2=0
利用平方差公式解:1.y²-(2y-1)²=0
2.(x-1)²=4(x+2)²
用公式法解1.-½x²-3x+2=0 2.2x²-2√2x-3=0利用提公因式解:1.x²=4x 2.﹙x-2﹚²+2x(x-2)=0 3.(2x-1)²-4x+2=0利用平方差公式解:1.y²-(2y-1)²=02.(x-1)²=4(x+2)²
-1/2x^2-3x+2=0
x^2+6x-4=0
x=(-6±2√13)/2
x1=-3+√13
x2=-3-√13
2x^2-2√2x-3=0
x=(2√2±4√2)/4
x1=(3√2)/2
x2=-(√2)/2
x^2=4x
x^2-4x=0
x(x-4)=0
x1=0 x2=4
(x-2)^2+2x(x-2)=0
(x-2)(x-2+2x)=0
x1=2 x2=2/3
(2x-1)^2-4x+2=0
(2x-1)^2-2(2x-1)=0
(2x-1)(2x-3)=0
x1=1/2 x2=3/2
y^2-(2y-1)^2=0
(y+2y-1)(y-2y+1)=0
(3y-1)(1-y)=0
y1=1/3 y2=1
(x-1)²=4(x+2)²
(x-1)²-[2(x+2)]²=0
(x-1+2x+4)(x-1-2x-4)=0
(3x+3)(-x-5)=0
(x+1)(x+5)=0
x1=-1 x2=-5