78*26+39*48=39x2x26+39x48=39x52+39x48=39x(52+48)=39x100=3900985*89-986*88=(986-1)x89-986x88=986x89-89-986x88=986x(89-88)-89=986-89=8979999*2222+3333*3334=3333x3x2222+3333x3334=3333x6666+3333x3334=3333...