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1.点拨盲点,深化概念例1(数学第一册下第92页第11题)函数y=sin(-3x+π/4),x∈R在什么区间上是减函数·我板书学生作业:由2kπ+π/2≤-3x+π/4≤2kπ+3π/2,k∈Z得此函数的单调减区间为〔-2kπ/3-5π/
1. Blind blind spot, deepen the concept of Example 1 (the first mathematics under the first 92 questions 11) function y = sin (-3x + π / 4), x ∈ R in what range is a decreasing function · I board student work : From 2kπ+π/2≤-3x+π/4≤2kπ+3π/2,k∈Z The monotonically decreasing interval of this function is [-2kπ/3-5π/