r = (s2-s1)*100/s1
print(f'小明的成绩提升了{r:.1f}%')
print('小明的成绩提升了%.1f%%' % r)
print('小明的成绩提升了{0:.1f}%.'. format(r))
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r = (s2-s1)*100/s1
print(f'小明的成绩提升了{r:.1f}%')
print('小明的成绩提升了%.1f%%' % r)
print('小明的成绩提升了{0:.1f}%.'. format(r))