| A．2 | B．5 | C．20 | D．25 |
| A．7.8×0.12 | B．0.78×12 | C．780×0.012 |
| A．10倍 | B．100倍 | C．1000倍 |
| A．4.13×5.37 | B．41.3×53.7 | C．413×0.537 |
| A．0.03 | B．0.3 | C．3 |
| A．0.024 | B．2.4 | C．24 | D．240 |
| A．0.57×2.1 | B．0.57×0.9 | C．57×0.021 | D．0.57×0.21 |
| A．2×13.2 | B．0.2×0.132 | C．13.2×0.02 |
| A．0.736×2.4 | B．7.36×0.24 | C．0.736×24 | D．0.736×0.24 |
| A．0.38×14 | B．38×1.4 | C．3.8×0.14 |
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