已知x-2y=2012,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷8x的值2.(a^2-b^2)÷(b-a)的结果是?3.x^my^n÷1/4x^3y=4x^2,则M=?n=?
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已知x-2y=2012,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷8x的值2.(a^2-b^2)÷(b-a)的结果是?3.x^my^n÷1/4x^3y=4x^2,则M=?n=?
已知x-2y=2012,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷8x的值
2.(a^2-b^2)÷(b-a)的结果是?
3.x^my^n÷1/4x^3y=4x^2,则M=?n=?
已知x-2y=2012,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷8x的值2.(a^2-b^2)÷(b-a)的结果是?3.x^my^n÷1/4x^3y=4x^2,则M=?n=?
[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷8x
=(9x^2-4y^2-5x^2+2xy-10xy+4y^2)/(8x)
=(4x^2-8xy)/(8x)
=(x-2y)/2
=2012/2
=1006
(a^2-b^2)÷(b-a)
=(a-b)(a+b)/(b-a)
=-(b-a)(a+b)/(b-a)
=-a-b
x^my^n÷1/4x^3y=4x^2
4x^my^n÷x^3y=4x^2
4x^(m-3)y^(n-1)=4x^2
所以m-3=2,n-1=0
即m=5,n=1
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