17．计算下面各题．
| 0.64÷0.125×8 | 3×0.87÷0.87×2 | 5.694-5.694÷4.38 |
| 8.04÷0.3-8.04×0.3 | （1.25+12.5+125）×8 | [7.36-（5.2-0.64）]÷4 |
| 90.48÷[（6.47-3.57）×（9-8.48）] | [0.15+（3.74-1.8）÷0.4]×0.9． |
13．直接写出得数．
| 5.42+1.25×8= | 240×0.1×0.5= | 1.7-0.25-0.75= | 8.75×4÷8.75×4= |
| 100-8.4÷0.8= | 9.6÷960×0.1= | 0.09÷（1-0.97）= | 1.8×1-1.8= |
9．口算题
0 162514 162522 162528 162532 162538 162540 162544 162550 162552 162558 162564 162568 162570 162574 162580 162582 162588 162592 162594 162598 162600 162604 162606 162608 162609 162610 162612 162613 162614 162616 162618 162622 162624 162628 162630 162634 162640 162642 162648 162652 162654 162658 162664 162670 162672 162678 162682 162684 162690 162694 162700 162708 199269
| 0.75+2.5= | 6.5-5.6= | 10-0.125×80= | 10÷4= | 1.3÷0.13= |
| 5.6+5.6×9= | 1÷0.1-0.1÷1= | 1.7+0.3÷2= | 2.5×（4+0.4）= | 0.5×2÷0.5×2= |