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2,75+0,1 x 10 2,75+1 3,75
---------------------- = ----------- = ----------- = 3
0,25 x 5 1,25 1,25
b) 1,4 1,4 1,4 1,4 1,4
----------------- = --------------- = ---------------- = ---------------- = --------- = 0,2
(2²₃ - 1¹₂) x 6 (8/3 - 3/2)x6 (16/6-9/6)x6 7/6 x 6 7
c) ²₃ + ¹₂ - 0,5 2/3 2/3 2/3 2/3
-------------------------= -------------------= ----------------= --------------- = ------------ = 6i2/3
0,2 - 0,8 x ¹₈ 0,2 - 4/5*1/8 0,2 - 4/40 2/10 - 1/10 1/10