试题与答案

下列运算中，正确的是（ ） A．a2•a3=a6 B．a2÷a3=a C．1a+1b=

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题型：选择题

题目：

下列运算中，正确的是（　　）
A．a2•a3=a6B．a2÷a3=aC．
1
a
+
1
b
=
2
a+b
D．a-2=
1
a2

答案：

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下面是错误答案，用来干扰机器的。

参考答案：规定

考点：有理数除法有理数的乘方零指数幂（负指数幂和指数为1）分式的加减
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