257.3×9.9+25.73怎样简便怎样计算

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257.3×9.9+25.73怎样简便怎样计算257.3×9.9+25.73怎样简便怎样计算257.3×9.9+25.73怎样简便怎样计算257.3×9.9+25.73=257.3×9.9+257.3

257.3×9.9+25.73怎样简便怎样计算
257.3×9.9+25.73怎样简便怎样计算

257.3×9.9+25.73怎样简便怎样计算
257.3×9.9+25.73
= 257.3×9.9+257.3×0.1
=257.3×(9.9+0.1)
=257.3×10
=2573

=257.3×9.9+257.3×0.1

=257.3×(9.9+0.1)
=2573

请采纳,谢谢

=25.73*99+25.73=257.3

257.3×(10-0.1)+25.73=2573-25.73+25.73=2573