输出问题

先贴代码以示友好

def res1():
    print('x1=',end='')
    print('%.3f'%(-b/(2*a)))
    print('x2=',end='')
    print('%.3f'%(-b/(2*a)))
def res2():
    print('x1=',end='')
    print('%.3f'%((-b+pow(d,0.5))/(2*a)))
    print('x2=',end='')
    print('%.3f'%((-b-pow(d,0.5))/(2*a)))
def res3():
    print('x1=',end='')
    print('%.3f'%(-b/(2*a)),end='')
    print('+',end='')
    print('%.3f'%(pow(-d,0.5)/(2*a)),end='')
    print('i',end=' ')
    print('x2=',end='')
    print('%.3f'%(-b/(2*a)),end='')
    print('-',end='')
    print('%.3f'%(pow(-d,0.5)/(2*a)),end='')
    print('i')
a,b,c=map(int,input().strip().split())
d=b*b-4*a*c
if d==0:
    res1()
elif d>0:
    res2()
else:
    res3()

我只知道能这么该
print('x1='+str('%.3f'%d))
想问下由更好的方式吗