Hoặc
Số?
a) 517+.....17=1117
b) 7550+18.....=9350
c) .....31+10131=13031
d) 18125+12125=30.....
a) 517+617=1117
b) 7550+1850=9350
c) 2931+10131=13031
d) 18125+12125=30125