题目内容
口算.
800
÷100=( )450
÷90=( )6300
÷300=( )8000
÷400=( )
答案:8;5;21;20
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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= |