49*54验算

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• 1/1×2+1/2×3+1/3×4+1/4×5+1/5×6+1/6×7+1/7×8+1/8×9+1/9×10……1/49×50=?最好能有具体的简便计算过程
• 数列{an}的通项公式为an=49-2n,求当n为何值时,Sn最大?最大值为多少?（详细的解题思路）
• 50.The Great Wall in China is one of the wonders of the world.Wonders固定的吗,surprises,amusements,greats 可不可以?51.I am going to hang a new picture on this wall.Suspend也有悬挂之意,可否替代?52.The criminal was hanged for the crimes he had committed.这里的hang是什么意思53.The mountain village cannot be reached by telephone yet.Reached可以用arrived at 替代吗,get to 是固定的吗?54.He wanted to turn sand to gold.to是表目的吗?55.The monster turned out to be a man in a blanket.56.The toy was repa
• 数列{an}的通项公式为an=49-2n,求当n为何值时,Sn最大?最大值为多少?
• ⅴ.句型转换(每题1分,46.he is tall.he has long,straight hair.(连接成一句话) he is tall loⅴ.句型转换(每题1分,46.he is tall.he has long,straight hair.(连接成一句话) he is tall long straight hair.47.my mother is short and heavy.(对划线部分提问) your mother 48.cathy is not tall or short.(改为同义句) cathy is .49.is that your aunt?(肯定回答) ,it .50.my father likes playing chess.(对划线部分提问) your father 51.the pop singer has a new look.(改为否定句) the pop singer a new look.52.she wears funny glasses.(改为一般疑
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• 两个分数相除，商是49，如果被除数扩大4倍，除数缩小3倍，商是 ___ ．
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