r = (s2-s1)/s1
r = r*100
print('%.1f%%' % r)
print('小明成绩提升了%.1f%%' %r)
print('{0}成绩提升了{1:.1f}%'.format('小明',r))
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王一二_biu
r = (s2-s1)/s1
r = r*100
print('%.1f%%' % r)
print('小明成绩提升了%.1f%%' %r)
print('{0}成绩提升了{1:.1f}%'.format('小明',r))