34+34x99=34x1+34x99=34x(1+99)=34x100=340035x35+35x64+35=35x35+35x36+35x1=35x(36+35+1)=35x72=2520173x73-73x73=73x(173-73)=73x100=730098x37=37x(100-2)=3700-74=362699x49+49=49x(99+1)=49x100=4900125x9-125=125x(9-1)=125x8=1000