Вычислите, применяя распределительный закон:  очень надо!!!!!а)39×28+24×61+39×72+61×76=
б)73×81+27×9+27×81+73×9=
в)868×55-768×55+945×45-935×45=
г)618×51-518×51+951×49-851×49=
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