在横线里填合适的小数.
| 7元8分=________元 | 50厘米=________米 | 1吨2千克=________吨. |
直接写得数:
| 1- | 2×80%= | ||
| 15÷ | 35× |
| 234+299= | 7.8+0.32= | 5.6+3.75+6.25= | 15.2+89-5.2= |
| 420-280= | 6-0.45= | 99×88+88= | 48-0÷48= |
| 540÷18= | 13.2×100= | 125×29×8= | 6.5+3.5-6.5+3.5= |
| 160×5= | 3.8÷1000= | 300÷25÷4= | 15×4÷15×4= |
求未知数X.
| 6X+0.5×7=6 |