Răspuns:
1. Amplificam 3/4 cu 3=> 9/12, 1/6 cu 2=> 2/12, 2/3 cu 4=>8/12
2. 1/6+5/3+10/4=
Amplificam 1/6 cu 2, 5/3 cu 4 si 10/4 cu 3 =>
=>2/12+20/12+30/12=
22/12+30/12=52/12
3. 3[tex]\frac{4}{5\\}[/tex]-1[tex]\frac{3}{10}[/tex]-[tex]\frac{4}{15}[/tex]=
19/5-13/10-4/15
Amplificam 19/5 cu 6, 13/10 cu 3 si 4/15 cu 2=>
=>94/30-39/30-8/30=
94/30-31/30=63/30
