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(x+2)(x-2)+16 (x-1)(x-2)+3x(x+3)-4(x+2)(x-3)

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(x+2)(x-2)+16 (x-1)(x-2)+3x(x+3)-4(x+2)(x-3)
(x+2)(x-2)+16 (x-1)(x-2)+3x(x+3)-4(x+2)(x-3)
(x+2)(x-2)+16 (x-1)(x-2)+3x(x+3)-4(x+2)(x-3)
(x+2)(x-2)+16
=x²-4+16
=x²+12
(x-1)(x-2)+3x(x+3)-4(x+2)(x-3)
=x²-3x+2+3x²+9x-4(x²-x-6)
=x²-3x+2+3x²+9x-4x²+4x+24
=10x+28
再问: x+2)(x-2)+16 (x-1)(x-2)+3x(x+3)-4(x+2)(x-3) 两道式子 帮忙再解一下 。