1　含参数的式子 ｆ(ｘ) =ｇ(ｘ) 在什么条件下“在Ｒ上恒成立”与“在Ｒ上恒有解”是有区别的“ｆ(ｘ) =ｇ(ｘ) 在什么条件下对于任意实数ｘ恒成立”是求此式在Ｒ上成为恒等式的条件 ,即参数的范围 .用函数的观点看 ,命题等价于“在什么条件下 (即参数取什么范围内的值时 ) , 1 The equation f(x) = g(x) with a parameter Under what conditions “constant on R” and “constant on R” are different “f(x) = g(x) Under any condition, for any real number x is constant, it is a condition for finding the formula to be an identity on R, that is, the scope of the parameter. From the function point of view, the proposition is equivalent to ”under what conditions (that is, what range the parameter takes) When value),