简便计算12.25+36+7.75 85×199+85 721﹣303
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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1﹣
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②1﹣
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③
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﹣
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