MATHmatics(비교)보기RAWBlame되돌리기비교r2 vs r3......33<math>20ax</math>44<math>7bx=2an</math>556<math>20.</math> <math></math>6<math>20.</math> [math(\dfrac{b-2}3-\dfrac{1-b}2)]를 간단히 하면? [<math>4</math>점]