5.69×9.9用简便方法脱式计算
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5.69×9.9
=5.69×(10-0.1)
=5.69×10-5.69×0.1
=56.9-0.569
=56.9-(0.6-0.031)
=56.9-0.6+0.031
=56.3+0.031
=56.331
=5.69×(10-0.1)
=5.69×10-5.69×0.1
=56.9-0.569
=56.9-(0.6-0.031)
=56.9-0.6+0.031
=56.3+0.031
=56.331
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