出国留学首选一诺留学

　　1、四则运算加减乘除的表达

　　• 加(plus，add) 和(sum)

　　• 减(subtract) 差(difference)

　　• 乘(multiply，times) 积(product)

　　• 除(divide，divisible) 商(quotient)余数(remainder)

　　• A+B A is added to B

　　• B-A A is subtracted from B

　　• A×B A is multipled by B, multiple A with B

　　• A÷B A is divided by B

　　• A=2B：

　　• A twice as many as B

　　• twice as many A as B

　　• A is twice more than B

　　• 分数(fraction)：

　　• 分子(numerator)/分母(denominator)

　　• 比(ratio)：描述量与量之间的比较关系。

　　• 比例(proportion)：

　　• 正比例(be directly proportional to)

　　• 反比例(be inversely proportional to )

　　2.数列

　　一般需要观察数列找规律，很少考等差等比数列，但还是要记住这些通项公式：

　　An=A1+(n-1)*d，求和公式Sn=(A1+An)*n/2.

　　3.题目预测

　　(1)1,2,2,3,3,3,4,4,4,4

　　All positive integers appear in the sequence above, and each positive integer k appears in the sequence k times. In the sequence, each term after the first is greater than or equal to each of the terms before it. If the integer 12 first appears in the sequence as the nth term, what is the value of n?

　　(2)2,6,12

　　The first term of sequence above equals 1*2, the second term equals 2*3, and the third term equals 3*4. In general, the nth term of the sequence equals n*(n+1). What is the 20th term minus the 19th term?

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