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1) (m:5+3) * 6=46

2) 7*t-14=28

3) 56: (36:r-2) = 8

1) (m:5+3) * 6=46

(m/5 + 3) * 6=46

6m/5+18=46

6m+90=230

6m=230-90

6m=140

m=70/3

m=23 1/3 или m≈23,3

2) 7*t-14=28

7t=28+14

7t=42

t=6

3) 56: (36:r-2) = 8

r≠18

r≠0

56: (36/r-2) = 8

56:36-2r/r=8

56*r/36-2r=8

56*r/2 (18-r) = 8

28*r/2 (18-r) = 8

28*r/18-r=8

28r/18-r=8

28r=8 (18-r)

28r=144-8r

28r+8r=144

36r=144

r=4