905乘以99加905又简便运算怎么算1000*99-99+199就可以了O(∩_∩)O哈哈~

分类: 作业答案 • 2021-12-19 11:53:19

问题描述：

905乘以99加905又简便运算怎么算
1000*99-99+199就可以了O(∩_∩)O哈哈~

答

等于905乘以100

答

=1000*99-99+100+99
=1000*99+100
=99100
905*99+905
=905(99+1)
=90500

答

905×99+905
=905×(99+1)-905
=905×100-905+905
=90500-905+905
=90500

答

905*99+905
=905*(99+1)
=905*100
=90500
1000*99-99+199
=1000*99-(100-1)+(200-1)
=99000-100+1+200-1
=99000+100
=99100

答

905×99+905
=905×(99+1)
=905×100
=90500
1000×99-99+199
=99000+(199-99)
=99000+100
=99100