将函数 y=sin(x−π3) 的图象上所有点的横坐标伸长到原来的2倍（纵坐标不变），再将所得的图象向左平移 π3 个单位，得到的图象对应的解析式是_刷题宝

题干

将函数 y=sin(x−

π

3

) 的图象上所有点的横坐标伸长到原来的2倍（纵坐标不变），再将所得的图象向左平移

π

3

个单位，得到的图象对应的解析式是（）

A： $y = \sin \frac{1}{2} x$

B： $y = \sin (\frac{1}{2} x - \frac{π}{2})$

C： $y = \sin (\frac{1}{2} x - \frac{π}{6})$

D： $y = \sin (2 x - \frac{π}{6})$

上一题下一题 0.0难度选择题更新时间:2018-08-20 08:08:22

答案(点此获取答案解析）

C

同类题1

下列物质能使品红溶液褪色，且褪色原理基本相同的是（）
（1）活性炭（2）氯水（3）二氧化硫（4）臭氧（5）过氧化钠（6）双氧水．

同类题2

William Henry Harrison, the ninth President of the USA, was born in a small town. When he was a boy, he was very quiet and shy. Because he was so quiet, everyone thought that he wasn't bright. People in the town often put a nickel(五分镍币)and a dime(十分硬币)before him and asked him which to choose. He always chose the nickel and they laughed.

One day a woman felt sorry for him. She asked, "Why do you never take a dime and always choose a nickel? Do you know a nickel is worth(值……钱) much less than a dime?"

"Certainly I know it.” William answered slowly. "But if I choose the dime, they will not ask me to choose them any more.”

同类题3

解方程： $\frac{x + 1}{x - 1}$ + $\frac{4}{1 - x^{2}}$ =1．

同类题4

公元前219年，秦始皇东巡，“作琅琊台，立石刻”。图2为琅琊石刻拓本，内中有“今皇帝并一海内，以为郡县，天下和平”字样。这些文字内容反映出秦始皇立琅琊石刻是为了（   ）

①宣示皇帝权威   ②宣扬君民同乐
③强调国家统一   ④推行郡县制度

同类题5

读“世界年降水量分布”图，完成下列问题．

小学学科试题库

初中学科试题库

高中学科试题库