MATHmatics(r3 Blame)보기RAWBlame되돌리기비교r3r1Cyber1[[분류:수학]]2<math>20×x×y=20xy</math>3<math>20ax</math>4<math>7bx=2an</math>r2Cyber5r3Cyber6<math>20.</math> [math(\dfrac{b-2}3-\dfrac{1-b}2)]를 간단히 하면? [<math>4</math>점]