如何解下列方程解下列方程 1. x/2x²-11x-21=x+7/x²-12x+35 2. x-4/x²+x-2=1/x-1+x-6/x²-4 3. 1/x+7=x+1/(2x-1)(x+7)+1/2x²-3x+1
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![如何解下列方程解下列方程 1. x/2x²-11x-21=x+7/x²-12x+35 2. x-4/x²+x-2=1/x-1+x-6/x²-4 3. 1/x+7=x+1/(2x-1)(x+7)+1/2x²-3x+1](/uploads/image/z/8614114-34-4.jpg?t=%E5%A6%82%E4%BD%95%E8%A7%A3%E4%B8%8B%E5%88%97%E6%96%B9%E7%A8%8B%E8%A7%A3%E4%B8%8B%E5%88%97%E6%96%B9%E7%A8%8B+1.+x%2F2x%26%23178%3B-11x-21%3Dx%2B7%2Fx%26%23178%3B-12x%2B35+++2.+x-4%2Fx%26%23178%3B%2Bx-2%3D1%2Fx-1%2Bx-6%2Fx%26%23178%3B-4+++++3.+1%2Fx%2B7%3Dx%2B1%2F%282x-1%29%28x%2B7%29%2B1%2F2x%26%23178%3B-3x%2B1)
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如何解下列方程解下列方程 1. x/2x²-11x-21=x+7/x²-12x+35 2. x-4/x²+x-2=1/x-1+x-6/x²-4 3. 1/x+7=x+1/(2x-1)(x+7)+1/2x²-3x+1
如何解下列方程
解下列方程 1. x/2x²-11x-21=x+7/x²-12x+35 2. x-4/x²+x-2=1/x-1+x-6/x²-4 3. 1/x+7=x+1/(2x-1)(x+7)+1/2x²-3x+1
如何解下列方程解下列方程 1. x/2x²-11x-21=x+7/x²-12x+35 2. x-4/x²+x-2=1/x-1+x-6/x²-4 3. 1/x+7=x+1/(2x-1)(x+7)+1/2x²-3x+1
解1:
x²+5x+2=0
x=[-5±√(5²-4×2)]/2
x=(-5±√17)/2
x1=(-5+√17)/2、x2=-(5+√17)/2
解2:
x²-2x-2=0
(x-1)²-3=0
(x-1)²=3
x-1=±√3
x1=1+√3、x2=1-√3
解3:
(x-3)(x-4)=5x
x²-7x+12=5x
x²-12x+12=0
(x-6)²-36+12=0
(x-6)²=24
x-6=±2√6
x1=6+2√6、x2=6-2√6
解4:
x²+3=3(x+1)
x²+3=3x+3
x²-3x=0
x(x-3)=0
x1=0、x2=3