1)

79³/₁₆-1¹/₁₂-77¹/₂+2¹³/₄₈= 1277/16-13/12-155/2+109/48=

(1277*3-13*4-155*24+109)/48=(3831-52-3720+109)/48=168/48=7/2.

2)

37⁴¹/₄₅-36⁴/₅=1706/45-184/5=(1706-184*9)/45=(1706-1656)/45=50/45=10/9.

3)

9⁹/₁₀:(7/2)=(99*10):(7/2)=99*2/(10*7)=99/35.

4)

(99/35)*(10/9)=99*10/(35*9)=22/7=3¹/₇.