PYPYPYPYP！！！！！！！求助 b=0 a=float(input()) if a>=0 and a<5: b=-a+2.5 print('%.3f'%b) elif a>=5 and a<10:b=2-1.5*(a-3)*(a-3) print('%.3f'%a) else: b=a/2-1.5 print('%.3f'%b)