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401×18怎样简便计算

401×18 =(400+1)×18 =400×18+1×18 =7200+18 =7218 望采纳。

28872

400×25+25

363+401 =363+(400+1) =363+400+1 =763+1 =764

0.75×401 =(400+1)×0.75 =400×0.75+1×0.75 =300+0.75 =300.75

401一203简便计算 =401一(200+3) =401一200一3 =201一3 =198

(1)17×( 3 17 + 7 18 )×18-40,=17× 3 17 ×18+ 17× 7 18 ×18-40 ,=54+119-40,=173-40,=133;(2)1.25×3.2×0.25,=(1.25×0.8)×(4×0.25),=1×1,=1;(3)7 7 8 -(3.875-2.64),=7.875-3.875+2.64,=4+2.64,=6.64;

401x19 =400x19+19 =7600+19 =7619

401x23 =(400+1)×23 =400×23+23 =9200+23 =9223

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