1) 0,75×11 1/3-8,9÷8 1/11
0,75= 75/100, 11 1/3= 34/3
75/100×34/3= 850/100 = 8,5
8 1/11= 89/11, 8,9 = 8 9/10= 89/10
89/10÷89/11= 11/10=1,1
8,5-1,1=7,5
2) 15 1/6÷18,2+0,13×7 1/13
15 1/6=91/6, 18,2=182/10
91/6÷182/10=80/91
0,13=13/10, 7 1/13=92/13
13/10×92/13=46/5
80/91+46/5=4586/455=10 36/455