Вычислите 1) 3/7(1/3+ 4/9) 2) 4/5-1/4: 5/6

Question

Вычислите 1) 3/7(1/3+ 4/9) 2) 4/5-1/4: 5/6

Answer 1

1)3/7(1/3+4/9)=3/7(3/9+4/9)=3/7*7/9=3/9=1/3
2)4/5-1/4:5/6=4/5-3/12:10/12=4/5-3/12*12/10=4/5-3/10=8/10-3/10=5/10=1/2