Question

已知y₁=x,y₂=,y₃=,y₄=,…,则y₁·y₂₀₁₄=(　　)

A.2x²               B.1             C.2             D.

Answer 1

C.∵y₁=x,∴y₂====,∴y₃==2÷=2×===x,因此,y₁,y₂,…,y₂₀₁₄的值分别为x,,…,每两个数一循环,则y₂₀₁₄=,∴y₁·y₂₀₁₄=x·=2.