Ответ: 1) у₁=5, у₂=11, у₃=21; 2) у₁=0, у₂=1,5, у₃=2 ²/₃; 3) у₁=-0,5, у₂=1, у₃=1,75; 4) у₁=3, у₂=2,25, у₃=3

Объяснение: 1) у₁ = 2*1²+3 = 2+3 = 5

у₂ = 2*2²+3 = 8+3 = 11

у₃ = 2*3²+3 = 18+3 = 21

2) у₁ = 1²-1/1 = 0/1 = 0

у₂ = 2²-1/2 = 3/2 = 1,5

у₃ = 3²-1/3 = 8/3 = 2 ²/₃

3) у₁ = 4*1-5/1+1 = -1/2 = -0,5

у₂ = 4*2-5/2+1 = 3/3 = 1

у₃ = 4*3-5/3+1 = 7/4 = 1,75

4) у₁ = 3¹/1² = 3/1 = 3

у₂ = 3²/2² = 9/4 = 2,25

у₃ = 3³/3² = 27/9 = 3