4.39×9.9+0.434简便计算？
3个回答
展开全部
=4.34*9.9+0.434+0.05*9.9
=0.434*99+0.434+0.5-0.005
=43.4+0.5-0.005
=43.895
=0.434*99+0.434+0.5-0.005
=43.4+0.5-0.005
=43.895
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展开全部
4.39×9.9+0.434
=4.39*9.9+0.439-0.005
=4.39×9.9+4.39*0.1-0.005
=4.39*（9.9+0.1）-0.005
=4.39*10-0.005
=43.9-0.005
=43.895
=4.39*9.9+0.439-0.005
=4.39×9.9+4.39*0.1-0.005
=4.39*（9.9+0.1）-0.005
=4.39*10-0.005
=43.9-0.005
=43.895
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展开全部
4.39×9.9+0.434
=4.39x（10-0.1）+0.434
=43.9-0.439+0.434
=43.9-（0.439-0.434）
=43.9-0.005
=43.895
=4.39x（10-0.1）+0.434
=43.9-0.439+0.434
=43.9-（0.439-0.434）
=43.9-0.005
=43.895
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