问题设集合M={(a,b)|a≤-1,且b≤m},其中m∈R.若对任意的(a,b)∈M,均有a·2b-b-3a≥0,求实数m的最大值.一、主元思想我们可以把问题中的条件理解为一个变量的函数的值在其定义域上恒大于或等于零,于是问题的关键是求出这个函数的最小值,为此一般可以先研究这个函数的单调性.那么,以哪个变量作为主变量,应当是首先要 The problem set M = {(a, b) | a≤-1, and b≤m}, where m∈R. For any (a, b) ∈M, a · 2b-b- 0, the maximum of the real number m First, the idea of ​​the principal element We can understand the conditions of the problem as a function of the value of the variable in its domain constant greater than or equal to zero, so the key issue is to find the minimum of this function Value, for this generally can first study the monotonicity of this function. So, which variable as the main variable, it should be the first to