[（2x^2+y)^2-5y^2(3x^2+1)-4(x^2+y）（x^-y)]÷5x^y,其中x=99,y=15分之2

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[（2x^2+y)^2-5y^2(3x^2+1)-4(x^2+y）（x^-y)]÷5x^y,其中x=99,y=15分之2
[（2x^2+y)^2-5y^2(3x^2+1)-4(x^2+y）（x^-y)]÷5x^y,其中x=99,y=15分之2

[（2x^2+y)^2-5y^2(3x^2+1)-4(x^2+y）（x^-y)]÷5x^y,其中x=99,y=15分之2
原式=[4x^4+y^2+4x^2y-15y^2x^2-5y^2-4x^4+4y^2]/5x^2y
=[4x^2y-15y^2x^2]/5x^2y
=4/5-3y
代值
原式
=4/5-3*2/15
=4/5-2/5
=2/5

原式=[2x^4+y^2+4x^2y-15y^2x^2-5y^2-4x^4+4y^2]/5x^2y
=[-2x^4+4x^2y-15y^2x^2]/5x^2y
=-0.4x^2/y+0.8-3y
代值
原式=-0.4*99^2*15/2+0.8-3*2/15
=-3*99^2+0.4
=-3(10000-200+1)+0.4
=-30000+600-3+0.4

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