Răspuns :
Răspuns:
a × b = 414
( a + 10) × b = 644
a × b + 10 × b = 644
414 + 10 × b = 644
10 × b = 230
b = 230 ÷ 10
b = 23
a × 23 = 414
a = 414÷23 => a = 18
Răspuns:
a·b = 414
a·(b+10)=644
a·b+10a=644
414+10a=644
10a=644-414
10a=230=> a=230:10=>a =23
b = 414:23=>b=18