Выполните действие: 1) (1\12 + 1\6) : (3/8 - 1/4) 2) (1 - 4\9) : (1\3 - 1\4) 3) (1\3 - 5\16 ) : (1\6 - 1\8) 4) ( 5\7 - 2\3) : (4\9 - 5\12)

1) (1\12 + 1\6) : (3/8 - 1/4) = (1/12+2/12):(6/16-4/16)= 1/4:1/8=1/4*8/1=2 2) (1 - 4\9) : (1\3 - 1\4)= (9/9-4/9):(4/12-3/12)= 5/9:1/12=5/9*12/1=20/3=6 2/3 3) (1\3 - 5\16 ) : (1\6 - 1\8) = (16/48-15/48):(4/24-3/24)= 1/48:1/24=1/48*24/1=1/2 4) ( 5\7 - 2\3) : (4\9 - 5\12)= (15/21-14/21):(16/36-15/36)= 1/21:1/36=1/21*36/1=12/7=1 5/7

1)(1/12+1/6)÷(3/8-1/4)=(1/12+2/12):(3/8-2/8)= 3/12÷1/8=1/4×8/1=2; 2)(1-4/9)÷(1/3-1/4)=(9/9-4/9)÷(4/12-3/12)= 5/9÷1/12=5/9×12/1=20/3=6 2/3; 3)(1/3-5/16)÷(1/6-1/8)=(16/48-15/48)÷(4/24-3/24)= 1/48÷1/24=1/48×24/1=1/2; 4)(5/7-2/3)÷(4/9-5/12)=(15/21-14/21)÷(16/36-15/36)= 1/21÷1/36=1/21×36/1=12/7=1 5/7.