计算(2x+3)(4x^2+9)(2x-3)1】(2x+3)(4x^2+9)(2x-3)2】(2x-5y)(2x+5y)-(2x+3y)(2x-3y)
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计算(2x+3)(4x^2+9)(2x-3)1】(2x+3)(4x^2+9)(2x-3)2】(2x-5y)(2x+5y)-(2x+3y)(2x-3y)
计算(2x+3)(4x^2+9)(2x-3)
1】(2x+3)(4x^2+9)(2x-3)
2】(2x-5y)(2x+5y)-(2x+3y)(2x-3y)
计算(2x+3)(4x^2+9)(2x-3)1】(2x+3)(4x^2+9)(2x-3)2】(2x-5y)(2x+5y)-(2x+3y)(2x-3y)
解1:
(2x+3)(4x²+9)(2x-3)
=(2x+3)(2x-3)(4x²+9)
=(4x²-9)(4x²+9)
=16x^4-81
解2:
(2x-5y)(2x+5y)-(2x+3y)(2x-3y)
=4x²-25²-(4x²-9y²)
=4x²-25²-4x²+9y²
=-16y²
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