问题
选择题
下列可用平方差公式计算的是[ ]
A.(a + b)(a + b)
B.(a-b)(b-a)
C.(a -b)(-b + a)
D.(a-b)(-a-b)
答案
答案：D
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下列可用平方差公式计算的是[ ]
A.(a + b)(a + b)
B.(a-b)(b-a)
C.(a -b)(-b + a)
D.(a-b)(-a-b)
答案：D
It’s September1st, and we’re all back to school. It’s good to all my teachers and friends again. They all fine. We’re in Grade Eight this year. We have new subjects. I’m not very at Chinese, but Han Mei says she can me. I think I can it better. I like English very much. Zhang Hong likes English, . But she needs help. I I can help her. Mr Hu is our new English teacher. He know all of us, so he has our names on a piece of paper and our names before he begins his lesson.
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