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上亿只袋鼠

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方法一：

g1 = 72

g2 = 85

r = (g2-g1)/g1

p = r*100

print('The grade of Xiao Ming has increased by: %.1f %%' % p)

方法二：

g1 = 72

g2 = 85

r = (g2-g1)/g1

p = r*100

print('The grade of Xiao Ming has increased by: {0:.1f}%.'.format(p))

方法三：

g1 = 72

g2 = 85

r = (g2-g1)/g1

p = r*100

print(f'The grade of Xiao Ming has increased by: {p:.1f}%')

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