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42x28十71x47十47用简便方法计算该怎样做

42x28十71x47十47 =42*28+72*47 =42*(28+72)+72*5 =4200+360 =4560

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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