(x-3)(x-3)-6(x的2次方+x-1) (2x+1的2次方)-(x+3)的2次方-(x-1)的2次方+1

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(x-3)(x-3)-6(x的2次方+x-1)(2x+1的2次方)-(x+3)的2次方-(x-1)的2次方+1(x-3)(x-3)-6(x的2次方+x-1)(2x+1的2次方)-(x+3)的2次方-(

(x-3)(x-3)-6(x的2次方+x-1) (2x+1的2次方)-(x+3)的2次方-(x-1)的2次方+1
(x-3)(x-3)-6(x的2次方+x-1) (2x+1的2次方)-(x+3)的2次方-(x-1)的2次方+1

(x-3)(x-3)-6(x的2次方+x-1) (2x+1的2次方)-(x+3)的2次方-(x-1)的2次方+1
(x-3)(x-3)-6(x的2次方+x-1)
=x²-9-6x²-x+1
=-5x²-x-8
(2x+1)的2次方-(x+3)的2次方-(x-1)的2次方+1
=4x²+4x+1-x²-6x-9-x²+2x-1+1
=2x²-8