Răspuns :
729 = 7 x 100 + 2 x 10 + 9
7029 = 7 x 1000 + 0 x 100 + 2 x 10 + 9
702090 = 7 x 10000 + 0 x 10000 + 0 x 100 + 9 x 10
7020900 = 7 x 1000000 + 0 x 100000 + 2 x 10000 + 0 x 1000 + 9 x 100
a) 729=7×100+2×10+9
b) 7029=7×1000+2×10+9
c) 702090=7×100000+2×1000+9×10
d) 7020900=7×1000000+2×10000+9×100
b) 7029=7×1000+2×10+9
c) 702090=7×100000+2×1000+9×10
d) 7020900=7×1000000+2×10000+9×100