1.
2.
a) 112 = 11x52x5 = 5510
b) 154 = 15x254x25 = 375100
c) 315 = 31x25x2 = 6210
d) 18125 = 18x8125x8 = 1441000
3.
a) 625 = 6x425x4 = 24100
b) 5001000 = 500:101000:10 = 50100
c) 18200 = 18:2200:2 = 9100
d) 72600 = 72:6600:6 = 12100
e) 75625 = 75:25x4625:25x4 = 12100
4.
Đáp án: B.