句型转换。 |
1. They often clean their classroom after school . (改为被动语态) Their classroom _____ often _____ by them after school. 2. Li Lei gave Tom a new pen last week . (同上) A new pen _____ _____ _____ Tom last week . 3. A lot of people in China can speak English now . (同上) English ______ ____ ______ by a lot of people in China now. 4. I have learned English for about two years. (同上) English _____ _____ _____ for about two years. 5. They will publish these story-books next month. (同上) These story-books _____ _____ _____ next month. |
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如果代数式x的4次方+ax³+5x³-7x²-bx²+6x-2合并同类项后不含x³、x²的项, 求a 、b的值
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