题目内容
口算．
800÷25＝
460－300＝
360÷40＝
420×20＝
答案：16,160,9,8400
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口算．
| 800-250= | 30×40= | 8100÷900= | 10-0.98= | 105÷7= | 560+770= |
| 0.25×0.4= | 6.3÷0.07= | 0.64÷8= | 8.85×10= | 4.73+0.7= |  = |
 = |  = |  = | 3.6× = | 8×1.36×1.25= | 7.2×2.8+2.8×0.8= |