a)
a/11 = b/8 => a=11b/8
a) a+b=76 => 11b/8 +b=76
(amplificăm b si 76 cu 8)
=> 11b/8 + 8b/8 =608/8
=> 11b+8b=608=>19b=608=>b=608:19=>b=32
a=76-b=>a=76-32=>a=44
b)a-b=0,9
=> 11b/8 - b=0,9
=>11b/8 - b =9/10
(amplificăm 11b/8 cu 5, b cu 40 si 9/10 cu 4)
=>55b/40 - 40b/40 =36/40
=> 55b-40b= 36
=> 15b=36 => b=36:15=>b=2,4
a=0,9+2,4=>a=3,3
c)3a+b=41=>
3×11b/8+b=41=>
33b/8+b=41=>
(amplificam pe b si 41 cu 8)
=> 33b/8 + 8b/8 =41/8
=> 33b+8b=41
=> 41b=41=> b=1
a=11×b/8=>a=11/8
