简便计算 6.4+3.25+3.6 7.26-2.57-3.43 101×23 23×134-34×23 99×62+62.
第1个回答 2019-11-01
①6.4+3.25+3.6, =(6.4+3.6)+3.25, =10+3.25, =13.25; ②7.26-2.57-3.43, =7.26-(2.57+3.43), =7.26-6, =1.26; ③101×23, =(100+1)×23, =100×23+23, =2323; ④23×134-34×23, =23×(134-34), =23×100, =2300; ⑤99×62+62, =62×(99+1), =62×100, =6200.