问题
选择题
若|a|=3，|b|=2，且a＜b，a+b的值等于（ ）
A．1或5
B．1或-5
C．-1或-5
D．-1或5
答案
∵|a|=3，|b|=2；∴a=±3，b=±2；
又∵a＜b，∴a=-3，b=2，或a=-3，b=-2；
故a+b的值等于-1或-5．
故选C．
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若|a|=3，|b|=2，且a＜b，a+b的值等于（ ）
A．1或5
B．1或-5
C．-1或-5
D．-1或5
∵|a|=3，|b|=2；∴a=±3，b=±2；
又∵a＜b，∴a=-3，b=2，或a=-3，b=-2；
故a+b的值等于-1或-5．
故选C．
| 补全对话。从方框中选择适当的句子完成对话,其中有两项是多余选项。 | |
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