Question

5/7-4/8 =
1/2+ (3/7-0,45)=

Answer 1

5/7-4/8 = 40/56-28/56 = 12/56=6/28=3/14
1/2+ (3/7-0,45)= 1/2 + (3/7-45/100) = 1/2+(300/700-315/700)=1/2+(-15/700)=1/2+(-3/140)=1/2-3/140=70/140-3/140=-67/140

Answer 2

спосибо

Answer 3

помогите уравнения

Answer 4

1/3+x=5/4