8^10*3^30/7^30*4^15
=2^30*3^30/7^30*4^15
=4^15*3^30/7^30*4^15
=3^30/7^30
=9^15/7^30
=>4^15/7^30<9^15/7^30
=>4^15/7^30<8^10*3^30/7^30*4^15
Vì vế bên phải là 2³⁰.2³⁰ còn vế bên trái là 2³⁰.3³⁰
2³⁰.2³⁰ < 2³⁰.3³⁰
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