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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((3/2x方+xy-3/5y方)*(-4/3x方y方)
(3/2x方+xy-3/5y方)*(-4/3x方y方)
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