Explicație pas cu pas:
a) ab/10 + ab/100 =198/100
10ab+ab=198
10×ab+ab×1=198
ab(10+1)=198
ab × 11=198
ab=18 a=1 b=8
b) abc/10 - abc/100=1188/100
10×abc-abc×1=1188
abc(10-1)=1188
abc × 9 =1188
abc=132 a=1 b=3
c) aa/10+aaa/100+aaaa/1000=26568/1000
100×aa+10×aaa+aaaa=26568
aa00+aaa0+aaaa=26568
aa00+
aaa0+
aaaa
------------
26568 a=8
