Răspuns:
3/5(3/9+4/9) = 3/5*7/9=21/45=7/15
3/5(3/9+4/9) = 3/5*3/9+3/5*4/9=9/45+12/45=21/45=7/15
2/3(1/6+5/24) = 2/3(4/24+5/24)=2/3*9/24=18/72=1/4
2/3*1/6+2/3*5/24=2/18+10/72=18/72=1/4
1/7(7/15-3/10)=1/7(14/30-9/30)=1/7*5/30=1/42
1/7(7/15-3/10)=1/7*7/15-1/7*3/10=7/105-3/70=14/210-9/210=5/210=1/42
Explicație pas cu pas:
