(4X+1)(4X-1)-(2X-5)(2X+3)计算
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(4X+1)(4X-1)-(2X-5)(2X+3)计算
(4X+1)(4X-1)-(2X-5)(2X+3)
=16x^2-1-(4x^2-4x-15)
=16x^2-1-4x^2+4x+15
=16x^2-4x^2+4x+15-1
=12x^2+4x+14
=16x^2-1-(4x^2-4x-15)
=16x^2-1-4x^2+4x+15
=16x^2-4x^2+4x+15-1
=12x^2+4x+14
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