Răspuns:
13028x2=(10000+3000+20+8)x2
=10000x2+3000x2+20x2+8x2
=20000+6000+40+16
=26056
1107x3=(1000+100+7)X3
=1000x3+100x3+7x3
=3000+300+21
=3321
116241x2=(100000+10000+6000+200+40+1)X2
=100000x2+10000x2+6000x2+200x2+40x2 +1x2
=200000+20000+12000+400+80+2
=232482