1.y=3sin(2x+π/3) = 3 sin[ 2(x+π/6)],
2(x+π/6) = π/2 => x =π/12
=> 对称轴 x = kπ +π/12,或 x = kπ + 7π/12
2.y=sinx 的图像,振幅扩大为原来的3倍,向左平移π/6个单位,x方向压缩为原来的1/2.对称轴方程呢？谢谢哈对称轴方程: x = kπ +π/12或 x =kπ + 7π/12, x∈Z那对称中心呢？有老您了对称中心:( kπ - π/6, 0) 或 ( kπ + π/3, 0)x∈Z