数学计算:①(x-y)^7/(y-x)^6+(-x-y)^3/(x+y)^2 ②(-x^3)^4/((x^2)^3/x^6
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①(x-y)^7/(y-x)^6+(-x-y)^3/(x+y)^2
=(x-y)^7/(x-y)^6-(x+y)^3/(x+y)^2
=x-y+x+y
=2x
②(-x^3)^4/((x^2)^3/x^6
=x^12/(x^6*x^6)
=x^12/x^12
=1
=(x-y)^7/(x-y)^6-(x+y)^3/(x+y)^2
=x-y+x+y
=2x
②(-x^3)^4/((x^2)^3/x^6
=x^12/(x^6*x^6)
=x^12/x^12
=1
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:①(x-y)^7/(y-x)^6+(-x-y)^3/(x+y)^2
=(x-y)-(x+y)=x-y-x-y=-2y
②(-x^3)^4/((x^2)^3/x^6
=x^12/x^6/x^6=x^(12-6-6)=x^0=1
=(x-y)-(x+y)=x-y-x-y=-2y
②(-x^3)^4/((x^2)^3/x^6
=x^12/x^6/x^6=x^(12-6-6)=x^0=1
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