计算(1)(-3x^3)^2-4x^5*x (2)(a+3)^2-a(a+5)(3)
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计算(1)(-3x^3)^2-4x^5*x(2)(a+3)^2-a(a+5)(3)计算(1)(-3x^3)^2-4x^5*x(2)(a+3)^2-a(a+5)(3)计算(1)(-3x^3)^2-4x^
计算(1)(-3x^3)^2-4x^5*x (2)(a+3)^2-a(a+5)(3)
计算(1)(-3x^3)^2-4x^5*x (2)(a+3)^2-a(a+5)(3)
计算(1)(-3x^3)^2-4x^5*x (2)(a+3)^2-a(a+5)(3)
(-3x^3)^2-4x^5*x
=9x^6-5x^6
=4x^6
(2)(a+3)^2-a(a+5)
=a²+6a+9-a²-5a
=a+9
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