解一元二次方程!(1) -5x²-4x=1 (2)7分之2x²-4分之6x-1=0(3)-8(x+1)²-6(x+1)-1=0(4) - 6分之5(2x+1)² -3分之8(2x+1)=1(5) (-8x+1)²=(8x+1)²
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![解一元二次方程!(1) -5x²-4x=1 (2)7分之2x²-4分之6x-1=0(3)-8(x+1)²-6(x+1)-1=0(4) - 6分之5(2x+1)² -3分之8(2x+1)=1(5) (-8x+1)²=(8x+1)²](/uploads/image/z/583807-31-7.jpg?t=%E8%A7%A3%E4%B8%80%E5%85%83%E4%BA%8C%E6%AC%A1%E6%96%B9%E7%A8%8B%21%EF%BC%881%EF%BC%89+-5x%26%23178%3B-4x%3D1+%EF%BC%882%EF%BC%897%E5%88%86%E4%B9%8B2x%26%23178%3B-4%E5%88%86%E4%B9%8B6x-1%3D0%EF%BC%883%EF%BC%89-8%EF%BC%88x%2B1%EF%BC%89%26%23178%3B-6%EF%BC%88x%2B1%EF%BC%89-1%3D0%284%29+-+6%E5%88%86%E4%B9%8B5%EF%BC%882x%2B1%29%26%23178%3B+-3%E5%88%86%E4%B9%8B8%EF%BC%882x%2B1%29%3D1%285%29+%28-8x%2B1%29%26%23178%3B%3D%288x%2B1%29%26%23178%3B)
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解一元二次方程!(1) -5x²-4x=1 (2)7分之2x²-4分之6x-1=0(3)-8(x+1)²-6(x+1)-1=0(4) - 6分之5(2x+1)² -3分之8(2x+1)=1(5) (-8x+1)²=(8x+1)²
解一元二次方程!(1) -5x²-4x=1 (2)7分之2x²-4分之6x-1=0
(3)-8(x+1)²-6(x+1)-1=0
(4) - 6分之5(2x+1)² -3分之8(2x+1)=1
(5) (-8x+1)²=(8x+1)²
解一元二次方程!(1) -5x²-4x=1 (2)7分之2x²-4分之6x-1=0(3)-8(x+1)²-6(x+1)-1=0(4) - 6分之5(2x+1)² -3分之8(2x+1)=1(5) (-8x+1)²=(8x+1)²
1、
5x²+4x+1=0
判别式△=16-20<0
没有实数解
2、
两边乘14
x²-21x/4=7/2
x²-21x/4+441/64=7/2+441/64
(x-21/8)²=665/64
x=(21-√665)/8,x=(21+√665)/8
3、
吧x+1看做整体
-[4(x+1)+1][2(x+1)+1]=0
x+1=-1/4,x+1=-1/2
x=-5/4,x=-3/2
4、
两边乘6
5(2x+1)²+16(2x+1)+6=0
2x+1=(-8±√34)/5
x=(-13-√34)/10,x=(-13+√34)/10
5、
-8x+1=8x+1,-8x+1=-8x-1
第二个无解
所以x=0
问这么多居然不悬赏?
提高悬赏50,然后再采纳吧