精选优质文档-倾情为你奉上Test1. How many terms are there in the arithmetic sequence ? 2. Two years ago Peter was three times as old as his cousin Claire. Two years before that, Peter was four times as old as Claire. In how many years will the ratio of their ages be ？ 3. The ratio of the length to the width of a rectangle is . If the rectangle has diagonal of length , then the area may be expressed an for some const
