[trò đùa cá»§a sá»± ngẫu nhiên] [Dương Thuỵ] [This year, Henry will save a certain amount of his income, and he will spend the rest. Next year, Henry will have no income, but for each dollar that he saves this year, he will have 1 r dollars available to spend. In terms of r, what fraction of his income should Henry save this year so that next] [sách về tết cho bé] [tieu thuyet dai gia] [catherine howard] [lliwi] [mytologisk navn krydsord] [rompe la barrera del no fecha de publicaci] [Chọn đội tuyểm]