《中小学数学》(初中版)2016年第5期刊登了李静静的《利用网格构造图形求解三角函数值》(下称原文),其中拓广1的解答值得商榷,现将拓广1及其解答抄录如下:原文拓广1已知α,β均为锐角,tanα=a/m,tanβ=b/n(a/m,b/n不必为最简分数),其中a,b,m,n均为整数,求tan(α+β)的值. “Primary and secondary mathematics” (junior high school version) 2016 fifth issue of Li Jingjing “using grid structure graph solving trigonometric function value” (hereinafter referred to as the original), which Extension 1’s answer is questionable, extension 1 and The answer is reproduced as follows: The original extension 1 known α, β are acute, tanα = a / m, tanβ = b / n (a / m, b / n not necessarily the most simple fraction), where a, b, m , n are integers, find the value of tan (α + β).