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问题：【java先定义类求一元二次方程的解】
答案：↓↓↓ 管旭军的回答： 网友采纳 importjava.util.*; publicclassHello{ privatestaticScannersan=newScanner(System.in); publicstaticdoublereadNum(Stringinfo){ System.out.print(info); doubled=san.nextDouble(); returnd; } publicstaticvoidmain(String[]args){ doublea=Hello.readNum("输入平方项系数:"); doubleb=Hello.readNum("输入一次项系数:"); doublec=Hello.readNum("输入常数项:"); System.out.println(a+"x^2+"+b+"x+"+c+"=0"); doubled=b*b-4*a*c; if(d | 
