[5xy^2(x^2-3xy)-(-3x^2y^2)^3]/(5xy^2)

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[5xy^2(x^2-3xy)-(-3x^2y^2)^3]/(5xy^2)
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[5xy^2(x^2-3xy)-(-3x^2y^2)^3]/(5xy^2)
[5xy^2(x^2-3xy)-(-3x^2y^2)^3]/(5xy^2)

[5xy^2(x^2-3xy)-(-3x^2y^2)^3]/(5xy^2)
[5xy^2(x^2-3xy)-(-3x^2y^2)^3]/(5xy^2)
=[5xy^2(x^2-3xy)+27x^6y^6]/(5xy^2)
=5xy^2(x^2-3xy)/(5xy^2)+27x^6y^6/(5xy^2)
=x^2-3xy+27x^5y^4/5

5-2√6
=3-2√6+2
=(√3-√2)²
所以√(5-2√6)=√3-√2
8-4√3
=6-2√12+2
=(√6-√2)²
所以2-√3=(8-4√2)/4=(√6-√2)²/4
所以√(2-√3)=(√6-√2)/2

这是什么题目= =

[5xy^2(x^2-3xy)-(-3x^2y^2)^3]/(5xy^2)
=(5x^3y^2-15x^2y^3+27x^6y^6)/5xy^2
=x^2-3xy+27x^5y^4/5

3xy(x^2-xy^2+xy)-xy^2(2x^2-xy+2x) 因式分解X^3-2xy+xy^2 化简(3x^2-5xy)+{-x^2-[-3xy+2(x^2-xy)+y^2]} 化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] (xy-3x²)-(-2xy-x²)+(-2x²-3)-(-5+xy) 化简（3X平方-5Xy)+{-X平方-[-3Xy+2(X平方-xy) 2x²y-3(2xy-xy)-xy [5xy^2(x^2-3xy)-(-3x^2y^2)^3]/(5xy^2) x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2 5x^3y*(-3y)^2+(-6xy)^2*(-xy)+xy^3*(-4x^2) 12xy+(3x平方-5xy)-2(3xy+2x平方)计算 -3(xy-2x²)-[y²-(5xy-4x²)+2xy] 化简:xy分之3x^2+2xy-xy分之2x^2-xy= 已知（x+1）*（x+1）=-Iy-1I,求2（xy-（5xy）*（5xy））-3（（xy）*（xy）-xy） 5x^2y/-1/2xy*3xy^2 2xy+5y^2+( )=x^2+3xy 3xy(x^2y-xy^2+xy)-xy^2(2x^2-6xy+2x)过程 计算：3xy(x²y-xy²+xy)-xy²(2x-xy+2x）