我们知道,对于反比例函数f(x)=kx(k为常数,k≠0),则当k>0时,f(x)在(0,+∞)上取正值且是减函数;当k<0时,f(x)在(0,+∞)上取负值且是增函数.作为反比例函数单调性的一个应用,下面我们来看几个二元条件式取值范围问题的解答. We know that for the inverse function f (x) = kx (k is a constant and k ≠ 0), f (x) takes a positive value and is a decreasing function at (0, + ∞) When k <0, f (x) takes a negative value and is an increasing function on (0, + ∞). As an application of the monotonicity of the inverse proportion function, let us look at the solution of several binary conditional range questions .