ldcf.net
当前位置:首页 >> 98x199用巧算怎么做 >>

98x199用巧算怎么做

原式=98×(200-1) =98×200-98×1 =19600-98 =19600-100+2 =19500+2 =19502

原式=98×(200-1) =98×200-98×1 =19600-98 =19600-100+2 =19500+2 =19502

123×199 =123×(200-1) =123×200-123×1 =24600-123 =24477

444x185+777x180=111x4x185+111x7x180=111x(4x185+7x180)=111x(740+1260)=111x2000=222000 198x199199-199x198198=198x199x1001-199x198x1001=199x198x(1001-1001)=0

982-199怎么巧算? =982-200+1 =782+1 =783

975×579-198 =(976-1)×(578+1)-198 =976×578+976×1-578×1-1-198 =578×976+976-578-199 =578×976+199 (975×579-198)÷(578×976+199) =(578×976+199)÷(578×976+199) =1

198x199199一199x198198 =198×(199×1001)-199×(198×1001) =0

解: 99×99+199 =99×99+100+99 =99×(99+1)+100 =9900+100 =10000

199.199×198--198.198×199 =199×1.001×198-198×1.001×199 =0

网站首页 | 网站地图
All rights reserved Powered by www.ldcf.net
copyright ©right 2010-2021。
内容来自网络,如有侵犯请联系客服。zhit325@qq.com