一元二次方程 计算题(1)4x²-3x-1=0(用配方法); (2)5x²- 根号5x-6=0(精确到0.1)(3)(2x-1)²-7=3(x+1); (4)(2x+1)(x-4)=5;(5)(x²-3)²-3(3-x²)+2=0.
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![一元二次方程 计算题(1)4x²-3x-1=0(用配方法); (2)5x²- 根号5x-6=0(精确到0.1)(3)(2x-1)²-7=3(x+1); (4)(2x+1)(x-4)=5;(5)(x²-3)²-3(3-x²)+2=0.](/uploads/image/z/2113171-43-1.jpg?t=%E4%B8%80%E5%85%83%E4%BA%8C%E6%AC%A1%E6%96%B9%E7%A8%8B+%E8%AE%A1%E7%AE%97%E9%A2%98%EF%BC%881%EF%BC%894x%26%23178%3B-3x-1%3D0%EF%BC%88%E7%94%A8%E9%85%8D%E6%96%B9%E6%B3%95%EF%BC%89%EF%BC%9B+%EF%BC%882%EF%BC%895x%26%23178%3B-+%E6%A0%B9%E5%8F%B75x-6%3D0%EF%BC%88%E7%B2%BE%E7%A1%AE%E5%88%B00%EF%BC%8E1%EF%BC%89%EF%BC%883%EF%BC%89%EF%BC%882x-1%EF%BC%89%26%23178%3B-7%3D3%EF%BC%88x%2B1%EF%BC%89%EF%BC%9B+%EF%BC%884%EF%BC%89%EF%BC%882x%2B1%EF%BC%89%EF%BC%88x-4%EF%BC%89%3D5%EF%BC%9B%EF%BC%885%EF%BC%89%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%EF%BC%8E)
一元二次方程 计算题(1)4x²-3x-1=0(用配方法); (2)5x²- 根号5x-6=0(精确到0.1)(3)(2x-1)²-7=3(x+1); (4)(2x+1)(x-4)=5;(5)(x²-3)²-3(3-x²)+2=0.
一元二次方程 计算题
(1)4x²-3x-1=0(用配方法); (2)5x²- 根号5x-6=0(精确到0.1)
(3)(2x-1)²-7=3(x+1); (4)(2x+1)(x-4)=5;
(5)(x²-3)²-3(3-x²)+2=0.
一元二次方程 计算题(1)4x²-3x-1=0(用配方法); (2)5x²- 根号5x-6=0(精确到0.1)(3)(2x-1)²-7=3(x+1); (4)(2x+1)(x-4)=5;(5)(x²-3)²-3(3-x²)+2=0.
1:4x²-3x-1=0
(4X+1)(X-1)=0
4X+1=0;x-1=0
得 X=负的4分之1 X=1