今年高考数学试题与去年相比难度明显加大,选择题从解题方法与技巧上,如果采用演绎、归纳,由特殊到一般,注重数形结合思想比较容易入手.特别是数形结合,利用图像的直观性使得题目更易找到切入点和突破口.这里仅以全国理科数学选择题第9题为例,与大家共同探讨.题目已知w>0,函数f(x)=sin(ωx+π/4)在(π/2,π)单调递减,则ω This year’s college entrance examination mathematics test problem is significantly more difficult than last year. The multiple-choice questions from the problem-solving methods and techniques, if used in deduction, induction, from special to general, pay attention to the combination of number and shape ideas is more easy to start. Especially the combination of number and shape, use The intuitiveness of the image makes the subject easier to find entry points and breakthroughs. Here only the 9th problem of the national mathematics mathematics multiple-choice question as an example, together with everyone to discuss. The topic known w> 0, function f (x) = sin (ωx + π /4) Monotonically decreasing in (π/2, π), then ω