解方程:(1)2x^3-3x=0 (2)(3y+5)^2=4y^2对不起,是2x^2-3x=0,改怎么算呢?
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![解方程:(1)2x^3-3x=0 (2)(3y+5)^2=4y^2对不起,是2x^2-3x=0,改怎么算呢?](/uploads/image/z/988341-69-1.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8B%EF%BC%9A%EF%BC%881%EF%BC%892x%5E3-3x%3D0+%EF%BC%882%EF%BC%89%EF%BC%883y%2B5%EF%BC%89%5E2%3D4y%5E2%E5%AF%B9%E4%B8%8D%E8%B5%B7%EF%BC%8C%E6%98%AF2x%5E2-3x%3D0%EF%BC%8C%E6%94%B9%E6%80%8E%E4%B9%88%E7%AE%97%E5%91%A2%EF%BC%9F)
解方程:(1)2x^3-3x=0 (2)(3y+5)^2=4y^2对不起,是2x^2-3x=0,改怎么算呢?
解方程:(1)2x^3-3x=0 (2)(3y+5)^2=4y^2
对不起,是2x^2-3x=0,改怎么算呢?
解方程:(1)2x^3-3x=0 (2)(3y+5)^2=4y^2对不起,是2x^2-3x=0,改怎么算呢?
(1)2x^3-3x=0
x(2x²-3)=0
x=0或x²=3/2
x=0或x=±√6/2
(2)(3y+5)^2=4y^2
(3y+5)²-4y²=0
(3y+5+2y)(3y+5-2y)=0
(5y+5)(y+5)=0
y=-1或y=-5
(1) x(2x-3)=0, x=0或2x=3, x=0或x=3/2.
(2) 9y^2+30y+25=4y^2, 5y^2+30y+25=0, 即y^2+6y+5=0, (y+1)(y+5)=0, 所以y=-1或y=-5.