GRE
$$\frac{1}{2}(x+y)$$
$$\frac{1}{2}x + y$$
In the xy -plane, the slope of the line containing the points (a, b) and (0, 2)
In the xy -plane, the slope of the line containing the points (a, b) and (2, 0)
25000 +道题目
269本备考书籍