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toibaby
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
1 vat dao dong dieu hoa voi phuong trinh x=12sin(wt+pi/2)(cm).Sau khoang thoi gian t1=1/20s thi vat di dc quang duong 18cm.Quang duong vat di dc sau 1/2s la...
Ai bit chi? cu. the cho minh nha..! thanks
Ai bit chi? cu. the cho minh nha..! thanks