一些一元二次的解方程(要有过程)
来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/11/18 18:15:37
一些一元二次的解方程(要有过程)
2x^2+x=0
2x(x-3)= 5(x-3)
1/2x^2-3x=1
(x+2)^2-2x=3x^2
还有一题:x^2+x-1=0
2x^2+x=0
2x(x-3)= 5(x-3)
1/2x^2-3x=1
(x+2)^2-2x=3x^2
还有一题:x^2+x-1=0
2x^2+x=0
x(2x+1)=0
x=0,x=-1/2
2x(x-3)= 5(x-3)
2x^2-6x=5x-15
2x^2-11x+15=0
(2x-5)(x-3)=0
x=5/2,x=3
1/2x^2-3x=1
x^2-6x=2
x^2-6x+9=2+9
(x-3)^2=(±√11)^2
x-3=±√11
x=3+√11,x=3-√11
(x+2)^2-2x=3x^2
x^2+4x+4-2x=3x^2
2x^2-2x-4=0
2(x-2)(x+1)=0
x=2,x=-1
x^2+x-1=0
x^2+x+1/4=1/4+1=5/4
(x+1/2)^2=(±√5/2)^2
x+1/2=±√5/2
x=(-1+√5)/2,x=(-1-√5)/2
x(2x+1)=0
x=0,x=-1/2
2x(x-3)= 5(x-3)
2x^2-6x=5x-15
2x^2-11x+15=0
(2x-5)(x-3)=0
x=5/2,x=3
1/2x^2-3x=1
x^2-6x=2
x^2-6x+9=2+9
(x-3)^2=(±√11)^2
x-3=±√11
x=3+√11,x=3-√11
(x+2)^2-2x=3x^2
x^2+4x+4-2x=3x^2
2x^2-2x-4=0
2(x-2)(x+1)=0
x=2,x=-1
x^2+x-1=0
x^2+x+1/4=1/4+1=5/4
(x+1/2)^2=(±√5/2)^2
x+1/2=±√5/2
x=(-1+√5)/2,x=(-1-√5)/2