(1/13 - 2 3/4)*26= -69,5
1) 1/13 - 2 3/4=4/52 - 2 39/52= - 2 35/52
2) - 2 35/52 * 26= - 139/52 * 26= - 139/2= - 69,5
(5/6+1 1/10)*24=46,4
1) 5/6+1 1/10=25/30 + 1 3/30=1 28/30=1 14/15
2) 1 14/15 * 24=29/15 * 24=232/5=46,4
(4/9 - 3 1/15)*9=4/9 * 9 - 46/15 * 9=4 - 138/5=4 - 27,6= - 23,6