列式计算．①606个301减去606，差是多少？②12的3倍加上25的和，再乘15，积是多少？③1060与160的差除以178和142的差，商是多少？
直接写出得数．3= = = 0.3×0.2=5﹣= = = 4﹣（）=
请选择合适的方法计算下面各题．﹣ + 1﹣﹣ ﹣+++ ﹣﹣ +﹣．
下面各题，怎样算简便就怎样算．①++ ②1﹣﹣ ③+﹣．
直接写出得数．= = = == = = =
口算.= = = =
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= 0.3×0.2=
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= 4﹣（
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﹣
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1﹣
﹣
﹣
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﹣
﹣
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﹣
．
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②1﹣
﹣
③
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﹣
．
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