解决方案: 算术运算符

这是上道题的答案：

Quiz: 平均电费

# Write an expression that calculates the average of 23, 32 and 64.
# Place the expression in this print statement.
print((23 + 32 + 64)/3)

Quiz: 计算

# Fill this in with an expression that calculates how many tiles are needed.
print(9*7 + 5*7)
# Fill this in with an expression that calculates how many tiles will be left over.
print(17*6 - (9*7 + 5*7))

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