Răspuns :
200+10a+b+100a+10b+3=830
100(2+a)+10(a+b)+b+3=830 | -3
100(2+a)+10(a+b)+b=827 => b=7
a+7=12 =>a=5
=>257+573=830
100(2+a)+10(a+b)+b+3=830 | -3
100(2+a)+10(a+b)+b=827 => b=7
a+7=12 =>a=5
=>257+573=830
2ab+ab3=830 2ab+ 830 - 257+
ab3 2ab 573
----- ------ -----
830 ab3 830
257+573=830
a=5
b=7
ab3 2ab 573
----- ------ -----
830 ab3 830
257+573=830
a=5
b=7