Răspuns :
12.
a×b=414
a×(b+10)=644
a×b+10×a=644
a×b+10×a=644
a×b =414
___________
10×a=230
a=230:10
a=23
b=414:23
b=18
Răspuns:
a×b=414
a×(b+10)=644
a×b+b×10=644=>a×b=414
_________
b×10=644-414=230
b=230÷10=23
a=414÷23=18
Sper că am ajutat! Coroana?