1.This is a very difficult math problem that the students can't ______.

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• 1.This is a very difficult math problem that the students can't ______.
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• 句型转换【一空一词】1 When He went to Beijing[ ] [ ]anything2he went to Beijing,he took nothing with him..【改成同义句】合并为一句】 The problem is very difficult.We can't work it out.【The problem is[ ] difficult for [ ] [ ] work out.3 The meeting room is quite big.It can hold over eighty people.【合并为一句】The meeting room is big[ ] [ ] [ ]over eighty people.4 Zhang Yimou spent two years finishing the movie.【改为同义句】It [ ]Zhang Yimou two years[ ] [ ]the movie
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• 已知3/(x^2+3x)-x^2=3x+2,则x^2+3x的值为