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yi xie chu deng han shu zhi yu de qiu fa
Author(s): 
Pages: 36-37
Year: Issue:  6
Journal: High-School Mathematics

Keyword:  函数值域二次函数单调性单调函数判别式二次方程利用原式已知求法;
Abstract: <正> 一、利用函数的单调性求值域如果y=f(x),x∈[a,b],是单调函数,则由函数的单调性可知y=f(x)的值域为[f(a),f(b)]。例1.已知:y=lg(x+1)+5,x∈[0,99]。求函数的值域。
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