(3 7/12 - 2 13/24)* 4/5+(4 1/18 - 3 7/12)*6/17=

(3 7/12 - 2 13/24)* 4/5+(4 1/18 - 3 7/12)*6/17=1

1) 3 7/12- 2 13/24=43/12-61/24=86/24-61/24=25/24

2) 4 1/18- 3 7/12=73/18-43/12=146/36-129/36=17/36

3)25/24 * 4/5=100/120=5/6

4)17/36*6/17=1/6*1/1=1/6

5)5/6+1/6=6/6=1

(3.7/12-2.13/24)*4/5+(4.1/18-3.7/12)*6/17=1 

1) 3.7/12-2.13/24=(3-2)+(7/12-13/24)=1+14-13/24=1.1/24

2)4.1/18-3.7/12=(4-3)+(1/18-7/12)=1.2-21/36=36+2-21/36=17/36

3) 1.1/24*4/5=25/24*4/5=5/6

4)17/36*6/17=1/6

5) 5/6+1/6=6/6=1