已知△ABC满足,则△ABC是 A.等边三角形 B.锐角三角形 C.直角三角形 D.钝角三角形
已知函数则函数的反函数是
Suppose the least distance fron poinrs of the xurve(曲线)to the y-axis is then the velue of a is
当x.yi满足条件时,变量U=的取值范围是
Ahyperbola(双曲线)wjthvertices(顶点)(-2,5)and(-2,-3),has an asynptote(渐近线)that passes the point(2.5) Then an equarionk of the hyperbola is
函数的最小值是