输入一个数学计算表达式 然后输出计算结果？

Question

输入一个数学计算表达式，如:1+2

然后输出计算后的结果:1+2=3

这里计算表达式只计算一次即可，可以使用加减乘除任意一个,可以进行小数运算。

Answer 1

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