作业帮几道数学约分及计算题.约分：a^2+6a-7/a^2-4a+3x^3-x^2+x-1/x-1(x^2-x-2)^2/(x^2-1)^3(2-x)^3a+c-b/a^2-b^2+2bc-c^2x^3-x^2-x+1/1-x^2计算：(a^2+ab/-c)^3*(-ac/a^2-b^2)^4(xy-x^2)*(xy/x^2-2xy+y^2)*(x-y/x^2)
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几道数学约分及计算题.约分：a^2+6a-7/a^2-4a+3x^3-x^2+x-1/x-1(x^2-x-2)^2/(x^2-1)^3(2-x)^3a+c-b/a^2-b^2+2bc-c^2x^3-x^2-x+1/1-x^2计算：(a^2+ab/-c)^3*(-ac/a^2-b^2)^4(xy-x^2)*(xy/x^2-2xy+y^2)*(x-y/x^2)
几道数学约分及计算题.
约分：
a^2+6a-7/a^2-4a+3
x^3-x^2+x-1/x-1
(x^2-x-2)^2/(x^2-1)^3(2-x)^3
a+c-b/a^2-b^2+2bc-c^2
x^3-x^2-x+1/1-x^2
计算：
(a^2+ab/-c)^3*(-ac/a^2-b^2)^4
(xy-x^2)*(xy/x^2-2xy+y^2)*(x-y/x^2)
几道数学约分及计算题.约分：a^2+6a-7/a^2-4a+3x^3-x^2+x-1/x-1(x^2-x-2)^2/(x^2-1)^3(2-x)^3a+c-b/a^2-b^2+2bc-c^2x^3-x^2-x+1/1-x^2计算：(a^2+ab/-c)^3*(-ac/a^2-b^2)^4(xy-x^2)*(xy/x^2-2xy+y^2)*(x-y/x^2)
约分：
a^2+6a-7/a^2-4a+3
=(a+7)(a-1)/((a-3)(a-1)
=(a+7)/(a-3)
x^3-x^2+x-1/x-1
=(x^2(x-1)+x-1)/(x-1)
=x^2+1
(x^2-x-2)^2/(x^2-1)^3(2-x)^3
=-((x-2)^2(x+1)^2)/((x-1)^3(x+1)^3(x-2)^3)
=-1/((x-2)(x+1)(x-1)^3)
a+c-b/a^2-b^2+2bc-c^2
=(a-b+c)/((a^2-(b-c)^2)
=(a-b+c)/((a+b-c)(a-b+c))
=1/(a+b-c)
x^3-x^2-x+1/1-x^2
=(x^2(x-1)-(x-1))/(1-x^2)
=((x^2-1)(x-1))/(1-x^2)
=1-x
计算：
(a^2+ab/-c)^3*(-ac/a^2-b^2)^4
=-a^3(a+b)^3/c^3*c^4a^4/((a+b)^4*(a-b)^4)
=-a^7*c/((a-b)^4*(a+b))
(xy-x^2)*(xy/x^2-2xy+y^2)*(x-y/x^2)
=x(y-x)*xy/(x-y)^2*(x-y)/x^2
=-y
(a+7)/(a-3)
x^2+1
1/(x+1)(x-1)^3
1/(a-b-c)
1-x
-a^7*c/(a-b)^4*(a+b)
-y