用简便方法计算17.9x9.9x1·79？
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17.9×9.9×1.79
=17.9×（10－0.1）×1.79
=17.9×10×1.79－17.9×0.1×1.79
=179×1.79－1.79×1.79
=（200－20－1）×1.79－（2－0.2－0.01）×1.79
=200×1.79－20×1.79－1.79－2×1.79+0.2×1.79+0.01×1.79
=358－35.8－1.79－3.58+0.358+0.0179
=322.2－5.37+0.3759
=316.83+0.3759
=317.2059
=17.9×（10－0.1）×1.79
=17.9×10×1.79－17.9×0.1×1.79
=179×1.79－1.79×1.79
=（200－20－1）×1.79－（2－0.2－0.01）×1.79
=200×1.79－20×1.79－1.79－2×1.79+0.2×1.79+0.01×1.79
=358－35.8－1.79－3.58+0.358+0.0179
=322.2－5.37+0.3759
=316.83+0.3759
=317.2059
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