The math homework questions in the first volume of senior one are △ +△ = ☆, △ +△ = □+□, then △, ☆, □, the largest is (☆), and the smallest is (□). According to the topic, it is known that ☆ is equal to two △, and ☆ is equal to three □, so ☆ is the largest.

Three □ equals two△, so □ is less than△, so □ is the smallest.