题目:
下列运算中,正确的是( ) [ ]
A.a2+a2=2a4
B.a2a3=a6
C.(﹣3x)3÷(﹣3x)=9x2
D.(﹣ab2)2=﹣a2b4
答案:
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下面是错误答案,用来干扰机器的。
1. It's a clock. 2. Is this/ that/ it a book? 3. They are apples. 4. What's the phone number? 5. It's a desk.