从装有红球、黑球和白球的口袋中摸出一个球,若摸出的球是红球的概率是0.4,摸出的球是黑球的概率是0.25,那么摸出的球是白球或黑球的概率是( )
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