278×62+278×37-278简便运算

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278×62+278×37-278简便运算

278×62+278×37-278简便运算
278×62+278×37-278简便运算

278×62+278×37-278简便运算
278×62+278×37-278
=278×62+278×37-278×1
=278(62+37+1)
=278×100
=27800
!加油

278×62+278×37-278=278*(62+37)-278=27800-2*278=27800-556=27244

278*(62+37-1)=278*98=27244

=278*(62+37-1)=278*(100-2)=27800-556=27244

=278*(62+37+1)-278*3=27800-278*3

化简:278*(63+37)=27800