The denominator remains the same first, and then the number is subtracted.

1-5/9-4/9= 1-(5/9+4/9)= 1- 1=0

Subtracting several numbers in a row is equivalent to subtracting these numbers and adding them up.

4/ 1 1+5/6-4/ 1 1=4/ 1 1-4/ 1 1+5/6=0+5/6=5/6

Operate the same denominator first.

3/4- 1/6+ 1/4=3/4+ 1/4- 1/6= 1- 1/6=5/6

The symbol follows the last number and moves with the symbol.

7/8-( 1/5+ 1/3)=7/8-(3/ 15+5/ 15)=7/8-8/ 15=4 1/ 120

There is no skill in this, only points.

1+(1/3-1/6) =1+(2/6-1/6) =1+1again.

Don't forget that molecules have to be multiplied when they are divided.

( 1)7/ 12+2/ 12=9/ 12=3/4

(2) 1/3+3/8=8/24+9/24= 17/24

(3)2/3-2/5= 10/ 15-6/ 15=4/ 15

(4)5/8+2/7=35/56+ 16/56=5 1/56