26*19+13*19+39*81的简便计算怎样做

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26*19+13*19+39*81的简便计算怎样做
26*19+13*19+39*81的简便计算怎样做

26*19+13*19+39*81的简便计算怎样做
26*19+13*19+39*81
=(26+13)*19+39*81
=39*19+39*81
=39*(19+81)
=39*100
=3900

(26+13)*(19+81)=3900

26*19+13*19+39*81
=(26+13)*19+39*81
=39*19+39*81
=39*(19+81)
=39*100
=3900

26*19+13*19+39*81=(26+13)*19+39*81=39*19+39*81=39*(19+81)=3900

原式=(26+13)*19+39*81
=39*(19+81)
=39*100=3900

26*19+13*19+39*81
=(26+13)*19+39*81
=39*19+39*81
=39*(19+81)
=39*100
=3900