3.96×9.9+0.396简算
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3.96×9.9+0.396
=3.96×9.9+0.396x10×0.1
=3.96x9.9+3.96x0.1
=3.96x(9.9+0.1)
=3.96x10
=39.6
=3.96×9.9+0.396x10×0.1
=3.96x9.9+3.96x0.1
=3.96x(9.9+0.1)
=3.96x10
=39.6
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