1) (5 целых 1/6 - 3,25) × 4/23
5 1/6-3.25=31/6-13/4=62/12-39/12=23/12
23/12*4/23=1/3
2) (21,3 - 18 целых 3/4) × 3,4
21.3-18 3/4=21.3-18.75=2.55
2.55*3.4=8.67
3) 2 целых 1/7 : 5/6 × 7/9 - 1,9
2 1/7:5/6=15/7*6/5=18/7
18/7*7/9=2
2-1.9=0,1
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Answers & Comments
1) (5 целых 1/6 - 3,25) × 4/23
5 1/6-3.25=31/6-13/4=62/12-39/12=23/12
23/12*4/23=1/3
2) (21,3 - 18 целых 3/4) × 3,4
21.3-18 3/4=21.3-18.75=2.55
2.55*3.4=8.67
3) 2 целых 1/7 : 5/6 × 7/9 - 1,9
2 1/7:5/6=15/7*6/5=18/7
18/7*7/9=2
2-1.9=0,1