计算(-3x^2+5)(-3x^2-5)-x^2(3x+4)(3x-4)-16(-x)^2
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计算(-3x^2+5)(-3x^2-5)-x^2(3x+4)(3x-4)-16(-x)^2
![计算(-3x^2+5)(-3x^2-5)-x^2(3x+4)(3x-4)-16(-x)^2](/uploads/image/z/5375391-15-1.jpg?t=%E8%AE%A1%E7%AE%97%28-3x%5E2%2B5%29%28-3x%5E2-5%29-x%5E2%283x%2B4%29%283x-4%29-16%28-x%29%5E2)
原式=(9x^4-25)-x^2(9x^2-16)-16x^2
=9x^4-25-9x^4+16x^2-16x^2
=0
=9x^4-25-9x^4+16x^2-16x^2
=0
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