Пошаговое объяснение:
139×15+18×139+15×261+18×361 =
=15(139+261)+18(139+361)=
=15*400+18*500=6000+9000=15000
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Пошаговое объяснение:
139×15+18×139+15×261+18×361 =
=15(139+261)+18(139+361)=
=15*400+18*500=6000+9000=15000