а). 39*28 + 24*61 + 39*72 + 61*76 = 39*(28+72) + 61*(24+76) =
= 39*100 + 61*100 = 100*100 = 10000;
б). 73*81 + 27*9 + 27*81 + 73*9 = 81*(73+27) + 9*(27+73) = 90*100 = 9000;
в). 868*55 - 768*55 + 945*45 - 935*45 = 55*(868-768) + 45*(945-935) =
= 55*100 + 45*10 = 5500+450 = 5950;
г). 618*51 - 518*51 + 951*49 - 851*49 = 51*(618-518) + 49*(951-851) =
= 100*100 = 10000;
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Answers & Comments
а). 39*28 + 24*61 + 39*72 + 61*76 = 39*(28+72) + 61*(24+76) =
= 39*100 + 61*100 = 100*100 = 10000;
б). 73*81 + 27*9 + 27*81 + 73*9 = 81*(73+27) + 9*(27+73) = 90*100 = 9000;
в). 868*55 - 768*55 + 945*45 - 935*45 = 55*(868-768) + 45*(945-935) =
= 55*100 + 45*10 = 5500+450 = 5950;
г). 618*51 - 518*51 + 951*49 - 851*49 = 51*(618-518) + 49*(951-851) =
= 100*100 = 10000;
Verified answer
Листай вправо=>а)
б)
в)
г)
Удачи;)