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50x47十47x49十47怎么简便

47*52+47*49-47=47*(52+49-1)=47*100=4700

50x47十4947十47=50x47十(47x101+200)十47=(50x47十47x101)+200十47=7097+247=7344

原式=47x52+47x56-47x8=47x(52+56-8)=47x(108-8)=47x100=4700 供参考.

47X25十47十47X74=47x(25+1+74)=47x100=4700

50x50一49x49十48x48一47x47……十2x2一1x1=(50+49)*(50-49)+(48+47)*(48-47)+……+(2+1)*(2-1)=50+49+48+47+……+2+1=(50+1)*50÷2=1275

47x28十71x47十47=47*(28+71+1)=47*100=4700

50一49十48一47十46简便方法=1+1+46=48

49/50x99+49/50=49/50x99+49/50x1=49/50x(99+1)=49/50x100=98

53x47+47x46+47=(53+46+1)x47=100x47=4700

47x28十71x47十47怎样简便算47x28十71x47十47=47*(28+71+1)=47*100=4700

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