简便计算99×7+77×9+33×18
发布网友
发布时间:2022-04-29 13:19
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热心网友
时间:2022-06-28 17:57
99×7+77×9+33×18
=99×7+7×11×9+33×3×6
=99×7+7×99+99×6
=99×(7+7+6)
=99×20
=(100-1)×20
=2000-20
=1980
热心网友
时间:2022-06-28 17:57
99×7+77×9+33×18
=99×7+99×7+99×6
=99×7×2+99×6
=99×14+99×6
=99×(14+6)
=99×20
=1980