求未知数x.
①x÷0.75=1.54 | ②4x+2.8=7.2(写出检验过程) | ③x+6.53=21.1 | ④26.74-x=1.9. |
直接写出得数.
18×20= | 120÷40= | 400÷50= |
1000÷25= | 105×3= | 60×30= |
0×88÷8= | 25×16×4= | 37+127+63= |
计算下列各题(能简算要简算).
5.18+0.73+0.82 | 0.75×1.8÷1.5 | 12.5×7.1×0.8 |
6.12×99+6.12 | 8.6÷0.86+8×0.35 | 5.6×(18.5-8.5÷0.5) |