(1/2a的4次方x²-1/3a的3次方x²-3/4a的3次方x的4次方)/(-2/3a²),

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(1/2a的4次方x²-1/3a的3次方x²-3/4a的3次方x的4次方)/(-2/3a²),

(1/2a的4次方x²-1/3a的3次方x²-3/4a的3次方x的4次方)/(-2/3a²),
(1/2a的4次方x²-1/3a的3次方x²-3/4a的3次方x的4次方)/(-2/3a²),

(1/2a的4次方x²-1/3a的3次方x²-3/4a的3次方x的4次方)/(-2/3a²),
=-3/4a^2x^2+1/2ax^2+9/8ax^4