A:慰藉/声名狼藉汤圆/河水汤汤装潢/巧舌如簧
B:露富/不露声色粗犷/心旷神怡解嘲/解甲归田
C:落榜/丢三落四差役/差强人意模仿/大模大样
D:狙击/沮丧异常破绽/文化积淀缭绕/穷困潦倒
解方程:2x+1x2+x=56x+6
Some little boys have difficulty ______their hearts into the lesson for a long time.
(Ⅰ)求角A、B、C的大小;
(Ⅱ)函数f(x)=sin(2x+A)+cos(2x﹣ C2 ),求函数f(x)单调递增区间,指出它相邻两对称轴间的距离.