Goi nhung so can tim la ab .
Ta có: ab=axbx2, b (chẵn)
=>ax10+b=axbx2
=>b=axbx2‐ax10
=>b=ax﴾bx2‐10﴿
Đê bx2‐10 thì b phải là 6 hoặc 8
Nếu b=8, ta có:8= ax﴾8x2‐10﴿; 8=ax6. Vậy không có kết quả nào phù hợp với lý giải trên
Nếu b=6, ta có:6= ax﴾6x2‐10﴿; 6=ax2. Vậy a=3, suy ra ab=36
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