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#1 Created at ... [Delete] [Delete and Lock User]

s1 = 72
s2 = 85
s3= s2-s1
print('你去年的成绩是%d,今年的成绩是%d'  % (s1,s2))
print('今年比去年成绩提高了%0.2f%%'  %(s3/s1*100))

#2 Created at ... [Delete] [Delete and Lock User]

或者也可以不引入s3，直接用下面的代码。

s1 = 72
s2 = 85
print('小明啊，你看，你去年的成绩是%d,今年的成绩是%d,' %(s1,s2))
print('去年比今年提高了%0.2f%%，进步还是很大的嘛' %((s2-s1)/s1*100))

#3 Created at ... [Delete] [Delete and Lock User]

r = (s2-s1)/s1*100
print('提高了%.2f%%' % r)