化简:(1)3(x+1)的平方-5(x+1)(x-1)+2x(x-1) (2)(2x-5)(2x+1)-(2x-3)(2x+3)

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化简:(1)3(x+1)的平方-5(x+1)(x-1)+2x(x-1) (2)(2x-5)(2x+1)-(2x-3)(2x+3)

化简:(1)3(x+1)的平方-5(x+1)(x-1)+2x(x-1) (2)(2x-5)(2x+1)-(2x-3)(2x+3)
化简:
(1)3(x+1)的平方-5(x+1)(x-1)+2x(x-1) (2)(2x-5)(2x+1)-(2x-3)(2x+3)

化简:(1)3(x+1)的平方-5(x+1)(x-1)+2x(x-1) (2)(2x-5)(2x+1)-(2x-3)(2x+3)
(1)
=3(x^2+2x+1)-5(x^2-1)+2x^2-2x
=3x^2+6x+3-5x^2+5+2x^2-2x
=4x+8
(2)
=4x^2+2x-10x-5-(4x^2+6x-6x-9)
=-8x+4

原式=3x² 6x 3-5x² 5 2x²-2x
=4x 8
=4(x 2)
原式=4x²-8x-5-4x² 9
=-8x 4
=4(1-2x)

4x+8 4-8x