4(x方+y)(x方-y)-(2x方-y)方,其中x=2,y=-3

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4(x方+y)(x方-y)-(2x方-y)方,其中x=2,y=-3
4(x方+y)(x方-y)-(2x方-y)方,其中x=2,y=-3

4(x方+y)(x方-y)-(2x方-y)方,其中x=2,y=-3
4(x²+y)(x²-y)-(2x²-y)²
=4(x⁴-y²)-(2x²-y)²
=4(x⁴-y²)-(4x⁴-4x²y+y²)
=4x⁴-4y²-4x⁴+4x²y-y²
=4x²y-5y²
当 x=2,y=-3时,
原式=4×2²×(-3) - 5×(-3)²
=-48-45
=-93

解得4(x方+y)(x方-y)-(2x方-y)方＝4(2方－3)(2方＋3)-(4方＋3)方＝28－﹙19﹚∧2＝28－361＝333，如果满意请选为最佳答案

4(x^2+y)(x^2-y)-(2x^2-y)^2
=4(x^4-y^2)-(2x^2-y)^2
=4(x^4-y^2)-(4x^4-4x^2y+y^2)
=4x^4-4y^2-4x^4+4x^2y-y^2
=4x^2y-5y^2
=4*4*(-3)-5*(-3)^2
=-48-45
=-93

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