ПОМОГИТЕ С МАТЕМАТИКОЙ! 20 БАЛЛОВ!

Question

ПОМОГИТЕ С МАТЕМАТИКОЙ! 20 БАЛЛОВ!

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Comments

(k-1)ˇ2/169(1+kˇ3) . 13ˇ2(k+1)ˇ2/1-kˇ2=169(k+1)ˇ2/169(1+kˇ3)=(k+1)ˇ2/(1+k)(1-k+kˇ2)=(k+1)/(1-k+kˇ2)

Answer 1

(1-k)²/[169(k+1)(k²-k+1)]*169(1+k)²/(1-k)(1+k)=(1-k)/(k²-k+1)