题解列表

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输出问题

先贴代码以示友好```pythondefres1():print('x1=',end='')print('%.3f'%(-b/(2*a)))print('x2=',end='')print('%.3f'%(-b/(2*a)))defres2():print('x1=',

矩阵对角线求和(Python代码)

建立二维数组,然后求对角线和```a=[[0]*3]*3foriinrange(3):a[i]=[int(j)forjininput().split()]sum1=sum2=0foriinrange(3):sum1+=a[i][i]foriinrange(3):sum2+=a[i][2-i]print