计算下列各题
1×+2×+ | (+)×7×5 | 12-+÷ |
×[-(-)] | +×(-) |
直接写得数.
1-0.4= | 1÷×3= | 0.01÷0.1= | ×÷×= |
0.125×0.125= | 12.9985×3.0023≈ | -0.7+= | = |
能简算的要简算
3001-1998 | 3.9+ | |
5000-105×34 | 0.15÷0.25+0.75×1.2 | . |
口算: 223-99=________; | 24÷0.04=________; | 0.9+99×0.9=________; | 25×4÷25×4=________; |
7.5+0.25=________; | =________; | =________; | =________. |