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Câu 39:

Cho $a,b,x,y$

Câu 39: Cho a,b,x,ya,b,x,ya,b,x,y là các số thực dương và a,ba,ba,b khác 1. Mệnh đề nào sau đây đúng?

Thông tin câu hỏi

Câu 39:

Cho $a,b,x,y$ là các số thực dương và $a,b$ khác 1. Mệnh đề nào sau đây đúng?