①2x^2-(x+2)(x-2)-(x+1)^2 ②（2x-y)(4x^2+y^2)(2x+y）③（-2xy^2）(1/4x^3y)^2④4a^2x^2(-2/5a^4x^2y^3)÷(-1/5a^5x^4y^2)急高手帮帮忙!

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①2x^2-(x+2)(x-2)-(x+1)^2 ②（2x-y)(4x^2+y^2)(2x+y）③（-2xy^2）(1/4x^3y)^2④4a^2x^2(-2/5a^4x^2y^3)÷(-1/5a^5x^4y^2)急高手帮帮忙!
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①2x^2-(x+2)(x-2)-(x+1)^2 ②（2x-y)(4x^2+y^2)(2x+y）③（-2xy^2）(1/4x^3y)^2④4a^2x^2(-2/5a^4x^2y^3)÷(-1/5a^5x^4y^2)急高手帮帮忙!
①2x^2-(x+2)(x-2)-(x+1)^2 ②（2x-y)(4x^2+y^2)(2x+y）③（-2xy^2）(1/4x^3y)^2
④4a^2x^2(-2/5a^4x^2y^3)÷(-1/5a^5x^4y^2)急高手帮帮忙!

①2x^2-(x+2)(x-2)-(x+1)^2 ②（2x-y)(4x^2+y^2)(2x+y）③（-2xy^2）(1/4x^3y)^2④4a^2x^2(-2/5a^4x^2y^3)÷(-1/5a^5x^4y^2)急高手帮帮忙!
①2x^2-(x+2)(x-2)-(x+1)^2
=2x^2-(x^2-4)-(x^2+2x+1)
=2x^2-x^2+4-x^2-2x-1
=-2x+3
②（2x-y)(4x^2+y^2)(2x+y）
=（2x-y)(2x+y）(4x^2+y^2)
=(4x^2-y^2)(4x^2+y^2)
=16x^4-y^4
③（-2xy^2）(1/4x^3y)^2
=（-2xy^2）(1/16x^6y^2)
=-1/8 x^7 y^4
④4a^2x^2(-2/5a^4x^2y^3)÷(-1/5a^5x^4y^2)
=-8/5a^4 x^4 y^3)÷(-1/5a^5x^4y^2)
=8a^(-1) y

①2x^2-(x+2)(x-2)-(x+1)^2
=2x^2-(x^2-4)-(x^2+2x+1)
=2x^2-x^2+4-x^2-2x-1
=3-2x

②（2x-y)(4x^2+y^2)(2x+y）
=(2x-y)(2x+y)(4x^2+y^2)
=(4x^2-y^2)(4x^2+y^2)
=16x^4-y^4

③（-2xy^2）(1/4x^3y)^2
=-2xy^2/(16x^6y^2)
=-1/(8x^5)

①2x^2-(x+2)(x-2)-(x+1)^2
=2x^2-(x^2-4)-(x^2+2x+1)
=2x^2-x^2+4-x^2-2x-1
=3-2x

②（2x-y)(4x^2+y^2)(2x+y）
=(2x-y)(2x+y)(4x^2+y^2)
=(4x^2-y^2)(4x^2+y^2)
=16x^4-y^4

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①2x^2-(x+2)(x-2)-(x+1)^2
=2x^2-(x^2-4)-(x^2+2x+1)
=2x^2-x^2+4-x^2-2x-1
=3-2x

②（2x-y)(4x^2+y^2)(2x+y）
=(2x-y)(2x+y)(4x^2+y^2)
=(4x^2-y^2)(4x^2+y^2)
=16x^4-y^4

③（-2xy^2）(1/4x^3y)^2
=（-2xy^2）(1/16x^6y^2)
=-1/8x^7y^4

④4a^2x^2(-2/5a^4x^2y^3)÷(-1/5a^5x^4y^2)
=-8/5a^6x^4y^3÷(-1/5a^5x^4y^2)
=8ay

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