脱式计算 (能简算的要简算).
72.8÷5.6+1.49 | 58.1-29.7÷3 | 30.94-5.09-4.91 |
3.94+34.3×0.2 | 5.4×2.3+5.4×7.7 | 3.2×12.5×0.25. |
用简便方法计算.
(1)101×67 | (2)98.5-42.28-7.72 | (3)1.38+14.7+8.62+5.3 | (4)3200÷4÷25. |
72.8÷5.6+1.49 | 58.1-29.7÷3 | 30.94-5.09-4.91 |
3.94+34.3×0.2 | 5.4×2.3+5.4×7.7 | 3.2×12.5×0.25. |
(1)101×67 | (2)98.5-42.28-7.72 | (3)1.38+14.7+8.62+5.3 | (4)3200÷4÷25. |