1.x/x-y * y^2/x+y -x^4y/x^4-y^4÷ x^2/x^2+y^2 2.(x^2-4/x^2-x-6+ x+2/x-3)÷ x+1/x-33.(x+1-1/1-x)÷(x- x^2/x-1)4.x-1/x^2+3x+2/6/2+x-x^2-10-x/4-x^21111111111111111111111111111111
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1.x/x-y * y^2/x+y -x^4y/x^4-y^4÷ x^2/x^2+y^2 2.(x^2-4/x^2-x-6+ x+2/x-3)÷ x+1/x-3
3.(x+1-1/1-x)÷(x- x^2/x-1)
4.x-1/x^2+3x+2/6/2+x-x^2-10-x/4-x^2
1111111111111111111111111111111
3.(x+1-1/1-x)÷(x- x^2/x-1)
=(x+1)^2(x-1)+(x+1)/(x+1)(x-1)除以-x/x-1
=(x+1){(x+1)(x-1)+1}/(x+1)(x-1)除以-x/x-1
=x^2/x-1*x-1/-x
=-x
1.x/(x-y)*y^2/(x+y)
=xy^2/[(x-y)(x+y)]
=xy^2/(x^2-y^2)
[x^4y/(x^4-y^4)]/[x^2/(x^2+y^2)]
={x^4y/[(x^2-y^2)(x^2+y^2)]}*[(x^2+y^2)/x^2]
=x^2y/(x^2-y^2)
所以原式=xy^2/(x^2-y^2)-x^2y/(x^2-y^2)
=(xy^2-x^2y)/(x^2-y^2)
=[xy(y-x)]/[[(x-y)(x+y)]
=-[xy(x-y)]/[[(x-y)(x+y)]
=-xy/(x+y)
还有一题………………不会!
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