4.9*9.9+0.49简便
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4.9*9.9+0.49简便4.9*9.9+0.49简便4.9*9.9+0.49简便4.9*9.9+0.49=4.9×9.9+4.9×0.1=4.9×(9.9+0.1)=4.9×10=494.9*9.
4.9*9.9+0.49简便
4.9*9.9+0.49简便
4.9*9.9+0.49简便
4.9*9.9+0.49
=4.9×9.9+4.9×0.1
=4.9×(9.9+0.1)
=4.9×10
=49
4.9*9.9+0.49
=4.9*(9.9+0.1)
=4.9*10
=49