| A．不变 | B．变大 | C．变小 | D．无法确定 |
| 3.56+7.5= | 3﹣2.08= | 2.25×48= |
| 44÷50= | 5.06×1.3= | 0.72÷1.5= |
| 35.5×180= | 50.4÷0.48= | 40.5÷0.18= |
| 1﹣0.01= | 0.2×0.3= | 0.32÷0.4= | 0.5﹣0.05= |
| 2.5+6.5= | 1÷0.01= | 10÷0.5= | 2.4×5= |
| 9.07﹣22.78÷3.4 | 4.15×9+4.15 | 1.25×0.25×32 |
| 1.05÷0.7+18.9 | 3.4×12.5+6.6×12.5 | 2.54+7.69+5.31+7.46 |
| A．0.645×2.8 | B．64.5×2.8 | C．645×0.028 | D．0.0645×2.8 |
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