a very very hard question8x^3+1 （分解因式）
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averyveryhardquestion8x^3+1（分解因式）averyveryhardquestion8x^3+1（分解因式）averyveryhardquestion8x^3+1（分解因式）用
a very very hard question8x^3+1 （分解因式）
a very very hard question
8x^3+1 （分解因式）
a very very hard question8x^3+1 （分解因式）
用立方和差公式：a^3+b^3=(a+b)(a^2-ab+b^2)
a^3-b^3=(a-b)(a^2+ab+b^2)得8x^3+1 =（2x+1)(4x^2-2x+1)
have a very hard time
a very very hard question8x^3+1 （分解因式）
A tunnel is very hard to build.
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work very hard中文翻译
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I__English very hard
maybe i worked very very hard.
maybe i worked very very hard.
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关于英语 she had had a very hard timeshe had had a very hard time 为什么用两个 had ..
very hard中hard是什么词性,very又是什么词性