(9x4乗-12x3乗+54x2乗)3x2乗

(9x4乗-12x3乗+54x2乗)3x2乗

(9x^4-12x^3+54x^2)÷3x^2
=3x^2(3x^2-4x+18)÷3x^2
=3x^2-4x+18