Question

Tìm số abc biết rằng:

220,33-ab,cd=abc,d

Answer 1

220,33-ab,cd=abc,d

abc,d+ab,cd=220,33

ab,cd x 10+ab,cd=220,33

ab,cd x (10+1)=220,33

ab,cd x 11=220,33

ab,cd=220,33:11

ab,cd=20,03

Vậy abc=200;abcd=2003