9.8*9.9+0.98用简便方法计算
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9.8*9.9+0.98用简便方法计算
9.8×9.9+0.98
=9.8×(10-0.1)+0.98
=9.8×10-9.8×0.1+0.98
=98-0.98+0.98
=97.2+0.98
=98
9.8*9.9+0.98用简便方法计算
9.8×9.9+0.98
=9.8×(10-0.1)+0.98
=9.8×10-9.8×0.1+0.98
=98-0.98+0.98
=97.2+0.98
=98