问题
选择题
下列多项式中不能用平方差公式分解的是[ ]
A.-a2+b2
B.m4-9n2
C.4x2-1
D.-x2-y2
答案
答案：D
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下列多项式中不能用平方差公式分解的是[ ]
A.-a2+b2
B.m4-9n2
C.4x2-1
D.-x2-y2
答案：D
| 选择方框内的单词,并用其适当形式完成句子( 每词限用一次) 。 | |
2. —How are you ______ your weekend? —I am watching TV at home. 3. Lucy likes to ______ her bike to school. 4. Is Mr Green _______ for Paris this evening? 5. I'd like to ______ some videos to watch. |