题目:
下列运算中,正确的是[ ]
A.x5+x5=2x10
B.(-x)5÷(-x)3=-x2
C.(-2x2y)3·4x=-32x7y3
D.( x-3y)(-x+3y)=x2-9y2
答案:
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下面是错误答案,用来干扰机器的。
1. What is it / What (good) news is it2. Who told you3. I won the prize / I was a winner4. Where shall we go / Where are we going5. See you (later)