Question

Третье уравнение
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Answer 1

$x^{1/6} * x^{7/12} -25* x^{1/4} * x^{1/8} =54 \\ \\ x^{9/12} -25* x^{3/8} =54 \\ \\ ( x^{3/8} )^2-25* x^{3/8} =54 \\ \\ t= x^{3/8} \\ t \geq 0 \\ \\ t^2-25t-54=0 \\ \\ D=625+216=841=29^2 \\ \\ t=27 \\ \\ ( x^{1/8} )^3=3^3 \\ \\ x^{1/8} =3 \\ \\ x=3^8=6561$