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99x83简便计算脱式计算

解:99*83=(100-1)*(80+3)=8000+300-80-3=8217

(100-1)*83=8300-83=8217 因为用100算比较好算,而99又是与它相近的数字

原式=99x83=(100-1)x83=100x83-1x83=8300-83=8217 供参考.

99x83+83 =(99+1)x83 =100x83 =8300

原式=1x83+99x83=(1+99)x83=100x83=8300

发讥篡客诂九磋循单末简便计算: 93*99+93 =93*99+93*1 =93*(99+1) =93*100 =9300

(100-1)x83=100x83-1x83=8300-83=8217

99x85 =(100-1)x85 =100x85-85 =8500-85 =8415

解:99乘83 =99X83 =(100-1)X83 =100X83-1X83 =8300-83 =8217

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