Cho a ,b là các số hữu tỉ khác 0 thoả man a^3+b^3=2ab
Cm căn của 1-ab là số hữu tỉ

Including 6% sales tax, an inn charges $135.68 per night. find the inns nightly cost

Amira is painting a rectangular banner 2 1/4 yards wide. the banner will have a blue background. amira has enough paint to cover 1 1/2 square yards of the wall. the school colors are blue and yellow, so amira wants to add yellow rectangles on the left and right sides of the blue rectangle. the yellow rectangles will each be 3/4 yards wide and the same height as the blue rectangle. what will be the total area of the two yellow rectangles?

Aadc is formed by reflecting aabc across line segment ac, as shown in the figure. if the length of ac is 4 units, the area of aadc is square units.