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140x78 780x86简便计算

140*78+780*86= 780x (14+86)= 780x100=7800这里看到有两个78,另外14和86结合就是100,所以采用上面方面很简单的算出答案是7800

63*780+370*78=780*(63+37)=780*100=78000.

原式=480x78+78x10x52=480x78+78x520=(480+520)x78=1000x78=78000 或者=48x10x78+780x52=48x780+780x52=(48+52)x780=100x780=78000

998x78=(1000-2)*78=1000*78-2*78=78000-156=77844

=780x11-780x1=780x(11-1)=780x10=7800

146x78-78x46=(146-46)x78=100x78=7800

47*101-47=47*(101-1)=47*100=4700

140*178-40*78=140x100+140x78-40x78=14000+78x(140-40)=14000+7800=21800

78乘42加21乘45加45的简便运算FZd7gyTBe9

780x69000=(800-20)x69000=800x69000-20x69000=61200000-1380000=59820000

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