计算:(3x+4)(3x-4)-(2x+3)(2x-3)
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计算:(3x+4)(3x-4)-(2x+3)(2x-3)计算:(3x+4)(3x-4)-(2x+3)(2x-3)计算:(3x+4)(3x-4)-(2x+3)(2x-3)(3x+4)(3x-4)-(2x
计算:(3x+4)(3x-4)-(2x+3)(2x-3)
计算:(3x+4)(3x-4)-(2x+3)(2x-3)
计算:(3x+4)(3x-4)-(2x+3)(2x-3)
(3x+4)(3x-4)-(2x+3)(2x-3)
=(9x²-16)-(4x²-9)
=9x²-16-4x²+9
=5x²-7
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