(x的n+2的次方-3xn+1的次方-2x的n次方)-2(x的n次方-5x的n+2次方)化简

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(x的n+2的次方-3xn+1的次方-2x的n次方)-2(x的n次方-5x的n+2次方)化简

(x的n+2的次方-3xn+1的次方-2x的n次方)-2(x的n次方-5x的n+2次方)化简
(x的n+2的次方-3xn+1的次方-2x的n次方)-2(x的n次方-5x的n+2次方)化简

(x的n+2的次方-3xn+1的次方-2x的n次方)-2(x的n次方-5x的n+2次方)化简
(x^(n+2)-3x^(n+1)-2x^n)-2(x^n-5x^(n+2)
=x^(n+2)-3x^(n+1)-2x^n-2x^n+10x^(n+2)
=11x^(n+2)-3x^(n+1)-4x^n
=(11x²-3x-4)x^n