35 БАЛЛОВ!
Докажите, что при любом натуральном значении n выражение (n^2+3n+1)^2-1 делится на 24 без остатка.

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1. I like to fly ... plane. It is so fast. 2. Did you buy the tiskets... the railway station? No I didnt . I bought them ... the airoport. 3. The plane is flying ... the blue sky ... the plains ... the seas. 4. Can I buy a tisket ... Moscow please? 5. Can you hear? Somebody is crying ... help. 6. Shall we go ... bus or shall we go ... foot?