1　填空题 （1）若y= ,则 （2）函数f（x）= 的间断点是_。 （3）曲线y=x-2/1在点（1,1）处的切线斜率是_。 （4）函数y=|x|在x=_处达到最小值,y的驻点_。 （5）若f（x）在（a,b）内满足f（x）<0,则f（x）在（a,b）内是_。 （6）若 　,则f（x）=_。 （7）某商品的边际收入为20-2q,则收入函数R（q）一_。 （8）微分方程y=e-x+2的通解是_。 （9）设有一组数据x1,x2,…,xn,其均值记为x-,则 1 fill in the blank (1) If y =, then (2) the function f (x) = break point is _. (3) Curve y = x-2/1 The tangent slope at point (1,1) is _. (4) The function y = | x | reaches the minimum value at x = _, the stagnation point of y _. (5) If f (x) satisfies f (x) <0 in (a, b) then f (x) is _ in (a, b). (6) If, then f (x) = _. (7) The marginal income of a commodity is 20-2q, then the income function R (q) _ _. (8) The general solution of differential equation y = e-x + 2 is _. (9) There is a set of data x1, x2, ..., xn, the mean recorded as x-, then