1.排竖式
2.用计算器
3.用手机
4.用电脑
这个四个方法,相信都是简便的
67×9+99×3
=67×9+33×9
=(67+33)×9
=100×9
=900
67×9+99×3
=67×3×3+99×3
=(201+99)×3
=300×3
=900
67×9+99×3
=67×(10-1)+3×(100-1)
=670-67+300-3
=970-70
=900
1)67(10-1)+33(10-1)
=670+330-(67+33)
=1000-100
=900
2)9(67+33)
=9*100
=900
3)67×9+99×3
=67×3×3+99×3
=(201+99)×3
=300×3
=900
(1)67(10-1)+(100-1)*3
=670-67+300-3
=970-70
=900
(2)9(67+33)
=9*100
=900
(3)67(10-1)+33(10-1)
=670+330-(67+33)
=1000-100
=900
+222222222