(1)(5-8x)^2=2 (2)x^2+8x=20 (3)3x^2+2x-3=0 (4)(x-1)(x+2)=70选择适当的方法解方程(1)(5-8x)^2=2(2)x^2+8x=20(3)3x^2+2x-3=0(4)(x-1)(x+2)=7055,没金了,对不起了. 要详细过程.
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/27 14:33:03
![(1)(5-8x)^2=2 (2)x^2+8x=20 (3)3x^2+2x-3=0 (4)(x-1)(x+2)=70选择适当的方法解方程(1)(5-8x)^2=2(2)x^2+8x=20(3)3x^2+2x-3=0(4)(x-1)(x+2)=7055,没金了,对不起了. 要详细过程.](/uploads/image/z/592313-41-3.jpg?t=%EF%BC%881%EF%BC%89%EF%BC%885-8x%EF%BC%89%5E2%3D2+%EF%BC%882%EF%BC%89x%5E2%2B8x%3D20+%EF%BC%883%EF%BC%893x%5E2%2B2x-3%3D0+%EF%BC%884%EF%BC%89%EF%BC%88x-1%EF%BC%89%EF%BC%88x%2B2%EF%BC%89%3D70%E9%80%89%E6%8B%A9%E9%80%82%E5%BD%93%E7%9A%84%E6%96%B9%E6%B3%95%E8%A7%A3%E6%96%B9%E7%A8%8B%EF%BC%881%EF%BC%89%EF%BC%885-8x%EF%BC%89%5E2%3D2%EF%BC%882%EF%BC%89x%5E2%2B8x%3D20%EF%BC%883%EF%BC%893x%5E2%2B2x-3%3D0%EF%BC%884%EF%BC%89%EF%BC%88x-1%EF%BC%89%EF%BC%88x%2B2%EF%BC%89%3D7055%2C%E6%B2%A1%E9%87%91%E4%BA%86%2C%E5%AF%B9%E4%B8%8D%E8%B5%B7%E4%BA%86.+%E8%A6%81%E8%AF%A6%E7%BB%86%E8%BF%87%E7%A8%8B.)
(1)(5-8x)^2=2 (2)x^2+8x=20 (3)3x^2+2x-3=0 (4)(x-1)(x+2)=70选择适当的方法解方程(1)(5-8x)^2=2(2)x^2+8x=20(3)3x^2+2x-3=0(4)(x-1)(x+2)=7055,没金了,对不起了. 要详细过程.
(1)(5-8x)^2=2 (2)x^2+8x=20 (3)3x^2+2x-3=0 (4)(x-1)(x+2)=70
选择适当的方法解方程
(1)(5-8x)^2=2
(2)x^2+8x=20
(3)3x^2+2x-3=0
(4)(x-1)(x+2)=70
55,没金了,对不起了.
要详细过程.
(1)(5-8x)^2=2 (2)x^2+8x=20 (3)3x^2+2x-3=0 (4)(x-1)(x+2)=70选择适当的方法解方程(1)(5-8x)^2=2(2)x^2+8x=20(3)3x^2+2x-3=0(4)(x-1)(x+2)=7055,没金了,对不起了. 要详细过程.
(1)(5-8x)^2=2
(8x-5)^2-2=0
(8x-5-√2)(8x-5+√2)=0
x=(5+√2)/8或x=(5-√2)/8
(2)x^2+8x=20
x^2+8x-20=0
(x+10)(x-2)=0
x=-10或x=2
(3)3x^2+2x-3=0
x^2+2x/3-1=0
x^2+2x/3+1/9-1/9-1=0
(x+1/3)^2-10/9=0
(x+1/3-√10/3)(x+1/3+√10/3)9=0
x=-1/3+√10/3或x=-1/3-√10/3
(4)(x-1)(x+2)=70
x^2+x-2=70
x^2+x-72=0
(x+9)(x-8)=0
x=-9或x=8