Question - Mathematical Operations with Decimals

Solution:

这是一道四则运算题目,题目中包含了小数的加减运算。(a) 题目要求我们计算$12.3+$59.2-$30.9+$46.1的结果。我们首先做加法,然后做减法:$12.3 + 59.2 = 71.5$$71.5 - 30.9 = 40.6$$40.6 + 46.1 = 86.7$因此,$12.3 + 59.2 - 30.9 + 46.1 = 86.7$。(b) 题目要求我们计算$145减去(a)部分的计算结果$,即$145 - 86.7$:$145 - 86.7 = 58.3$因此,(b)部分的答案是$58.3$。

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