用简便方法计算.
7.85+6.76+2.15 | 18.43-3.76-7.24 | 21.65+(4.8-3.65) |
9.64-(4.64-1.23) | 2.7+17.6+3.3-5.6 | 9.87-3.5+2.13-8.5. |
解方程
3X-4×6=48 | X+3.5×3=18. |
7.85+6.76+2.15 | 18.43-3.76-7.24 | 21.65+(4.8-3.65) |
9.64-(4.64-1.23) | 2.7+17.6+3.3-5.6 | 9.87-3.5+2.13-8.5. |
3X-4×6=48 | X+3.5×3=18. |