Question

72×99的简便计算？

72×99的简便计算

Answer 1

因为99=100-1，所以原式等于72×（100-1）运用乘法分配律就是有72×100-72=7128

Answer 2

原式=72×（100-1）=72×100-72×1=7200-72=7128

Answer 3

72×100-99=7200-99=7101

Answer 4

72×99＝72×（100-1）＝72×100-72×1＝7200-72＝7128

Answer 5

72×99＝72×(100-1)=7200-72=7128