Вычислите а) (1/2:3/4-4/9):3/5 б)1/2:3/8-4/9:3/5

Question

Вычислите а) (1/2:3/4-4/9):3/5 б)1/2:3/8-4/9:3/5

Answer 1

(1/2:3/4-4/9):3/5=(1/2*4/3-4/9)*5/3=(2/3-4/9)*5/3=(6-4)/9*5/3=10/27
1/2:3/8-4/9:3/5=(1*8)/(2*3)-(4*5)/9*3)=8/6-20/27=(72-40)/54=32/54=16/27