x方分之y的三次方除-x分之y方的平方
已知X:Y=-2:3,求(xy分之X的平方-Y的平方)的平方除以【(X+Y)*(X分之X-Y)的3次方]除以y的平方分之x的...
已知X:Y=-2:3,求(xy分之X的平方-Y的平方)的平方除以【(X+Y)*(X分之X-Y)的3次方]除以y的平方分之x的
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(xy分之X的平方-Y的平方)的平方除以【(X+Y)*(X分之X-Y)的3次方]除以y的平方分之x
=[(x^2-y^2)^2/x^2y^2]÷[x^2-y^2)(x-y)^2/x]^3÷(x/y^2)
=[(x^2-y^2)^2/x^2y^2]*[x^3/(x^2-y^2)(x-y)^2]*y^2/x
=(x^2-y^2)/(x-y)^2
=(x+y)/(x-y)
=(x/y+1)/(x/y-1)
=(-2/3+1)/(-2/3-1)
=-1/5
=[(x^2-y^2)^2/x^2y^2]÷[x^2-y^2)(x-y)^2/x]^3÷(x/y^2)
=[(x^2-y^2)^2/x^2y^2]*[x^3/(x^2-y^2)(x-y)^2]*y^2/x
=(x^2-y^2)/(x-y)^2
=(x+y)/(x-y)
=(x/y+1)/(x/y-1)
=(-2/3+1)/(-2/3-1)
=-1/5
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