解方程(2x+1)(2x-1)+3(x+2)(x-2)=(7x-1)(7x+1)
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![解方程(2x+1)(2x-1)+3(x+2)(x-2)=(7x-1)(7x+1)](/uploads/image/z/45553-49-3.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8B%282x%2B1%29%282x-1%29%2B3%28x%2B2%29%28x-2%29%3D%287x-1%29%287x%2B1%29)
解方程(2x+1)(2x-1)+3(x+2)(x-2)=(7x-1)(7x+1)
解方程(2x+1)(2x-1)+3(x+2)(x-2)=(7x-1)(7x+1)
解方程(2x+1)(2x-1)+3(x+2)(x-2)=(7x-1)(7x+1)
(2x+1)(2x-1)+3(x+2)(x-2)=(7x-1)(7x+1)
4x²-1+3*(x²-4)=49x²-1
4x²+3x²-12=49x²
-12=42x²
x²=-4/21
方程无解
(2x+1)(2x-1)+3(x+2)(x-2)=(7x-1)(7x+1)
(4x^2-1)+3(x^2-4)=49x^2-1
7x^2-13=49x^2-1
-12=42x^2
x^2=-2/7
显然方程无解。