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- 3把棱长30厘米的正方体钢坯，锻造成宽15厘米，高为9厘米的长方体钢条，它的长是多少厘米？
- 4what's the best gift you have ever received 为什么不是what's the best gift have you ever received
- 5若0≦α≦π,函数f(x)=2sin(x+α)cos(x+α)-2√sinx
- 6已知数列{an}满足an=n²+n+1/3.(1) 写出a10与an+1.(2)79又2/3是不是数列{an}的项,若是,那么第几项
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- 8一个数既是54的因数,又是9的倍数,还是2和3的因数,这个数是?
- 9已知a不等于0 ,证明x的方程ax=b有且只有一个根
- 10He is one of ____(famous )____(actor) in China.