（+3）+（-5）=（ ）
A. -8
B. +8
C. -2
D. +2

Number systemsOpposite numbers and absolute value
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Worked solution

1. 确定和的符号

两个加数 (+3)(+3) 与 (−5)(-5) 符号相反。比较它们的绝对值：∣+3∣=3|+3| = 3，∣−5∣=5|-5| = 5。
因为 5>35 > 3，即负数的绝对值较大，所以和的符号应取负号（−-）。

2. 计算绝对值的差并得出最终结果

用较大的绝对值减去较小的绝对值：
(+3)+(−5)=−(5−3)=−2(+3) + (-5) = -(5 - 3) = -2。
因此，正确答案为C。

Answer

C

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