18.5×9.7-18.2×4.7怎么用简便方法计算？ 5
2个回答
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18.5×9.7-18.2×4.7
=(18.2+0.3)x9.7-18.2x4.7
=18.2x9.7-18.2x4.7+0.3x9.7
=18.2x(9.7-4.7)+2.91
=18.2x5+2.91
=93.91
=(18.2+0.3)x9.7-18.2x4.7
=18.2x9.7-18.2x4.7+0.3x9.7
=18.2x(9.7-4.7)+2.91
=18.2x5+2.91
=93.91
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展开全部
18.5×9.7-18.2×4.7
=18.2x9.7+0.3x9.7-18.2x4.7
=18.2x（9.7-4.7）+0.3x9.7
=18.2x5+2.91
=91+2.91
=93.91
=18.2x9.7+0.3x9.7-18.2x4.7
=18.2x（9.7-4.7）+0.3x9.7
=18.2x5+2.91
=91+2.91
=93.91
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