[（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
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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

化简:5(x-y)+2(x+y)-3(x-y) 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) (2x-3y)-(5x-y) (2X-3y)-(5x-y) (2x-5y)(3x+y) 因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+（x-3y)(x-5y)+(x-2y)(x-4y) (2x+y)²+(x+3y)(x-3y)-x(5x+8y)因式分解 [2(x-y)^5-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2[2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2 x(x-y)2-(y-x)3 x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 [(x+2y)(x-2y)-(2x-y)^2+(3x-y))2x-5y)]/(-x)我急用 [2/3x-2/x+y(x+y/3x-x-y)]/x-y/x 化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x 计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x [(x+2y)(x-2y)-(2x-y)²+(3x-y(2x-5y)]/(-x)的解答 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x 计算：x+2y/x-y+2x/y-x-3y/x-y 化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方