| r3 vs r4 | ||
|---|---|---|
| ... | ... | |
| 2 | 2 | <math>20×x×y=20xy</math> |
| 3 | 3 | <math>20ax</math> |
| 4 | 4 | <math>7bx=2an</math> |
| 5 | [math(|lx|=\dfrac{1}3)] | |
| 6 | [clearfix] | |
| 7 | <math>20.</math> [math(\dfrac{b-2}3-\dfrac{1-b}2)]를 간단히 하면? [<math>4</math>점] | |
| 5 | 8 | |
| 6 | ||
| 9 | 1. [math(\dfrac{b-2}3-\dfrac{1-b}2)]를 일차식으로 하기 | |
| 10 | [clearfix] | |
| 11 | [math(\dfrac{b-2}3-\dfrac{1-b}2=\dfrac{6(b-2)}3-\dfrac{6(1-b)}2)] | |
| 12 | 2. 약분하기 | |
| 13 | [math(\dfrac{6(b-2)}3-\dfrac{6(1-b)}2=2(b-2)-3(1-b))] | |
| 14 | 3. 최종 계산 | |
| 15 | [math(2(b-2)-3(1-b)=(2b-4)-(3+3b))] | |
| 16 | [math(=5b-7)] |