：x．
．九月份一共用水泥多少吨？直接写得数．
| 1800-799= | 560÷8×7= |  ×24÷= | ________： = | +0.31= |
（1- ）×16= | 0.6÷6= | 6.4+9.6-12= | 0，3×0.3÷0.3×0.3= | 1÷-÷1= |
、
、
这3个分数按从小到大的顺序排列为________．
．直接写得数．
| 4.5+7.6= | 9-0.18= | 0.9×9= | 3.6÷9= |
| 0.2×3.3= | 1÷0.25= | 0÷5.4= | 3.89×0= |
| 7.25+2.75= | 10.8-8= | 2.5×4= | 80÷0.1= |
直接写得数．
| 1800-799= | 560÷8×7= | ×24÷= | ________：= | +0.31= |
| （1-）×16= | 0.6÷6= | 6.4+9.6-12= | 0，3×0.3÷0.3×0.3= | 1÷-÷1= |
| 4.5+7.6= | 9-0.18= | 0.9×9= | 3.6÷9= |
| 0.2×3.3= | 1÷0.25= | 0÷5.4= | 3.89×0= |
| 7.25+2.75= | 10.8-8= | 2.5×4= | 80÷0.1= |