| | | 7 | | | = 30 ~ 40 | 2 | = 80 ~ 90 2 | = 100 ~ 150 | | | | 2000 ~ 2500 | | | 20 | | 15 | 0.8 = | 40 2 40 ~50 1 | 50 0.5 | 3 | | | | | | | | = ÷ | | | | 20~30 | | | | | | | = ︹ | - ︺ 0.2 -4 -4 ~ -1 | -1 45 70 | 45 -70 0.2 = -5 | | | D | | | | | | | = 205 - = 220 - | 70% 55%~ 69% | 40%~54% | = 170- 70 | 170 -70=100 / | 170 - 0.9 | | a= 0.74 b = 0. 082+34.89 | = a-b ÷ 100% | b = 0.082+44.74 | 17%~23% 20%~27% | 25% 30 % | | | | 14%~20% 17%~24% | | 5% 15% | | | = ÷ | 1. | 2. | 3. | | | | | | | | |