简便计算99×7+77×9+33×18

简便计算99×7+77×9+33×18
2025-03-04 03:55:07
推荐回答(2个)
回答1:

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

回答2:

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