java编程 求解一元二次方程：ax^2+bx+c=0

可以用Scanner 逻辑上应该没错误 import java.util.Scanner; public class Test2 { public static String x(int a,int b,int c){ int x = b*b-4*a*c; double d; if(x<0){ return "无解"; }else{ d = Math.pow(x, 0.5); return (-b-d)/(2*a)+":"+(-b+d)/(2*