1.
(x2-1)/(1-x3)-x2/(x2+x+1)
2.
(x4-y4)/(x3+yx2-xy2-y3)-2y
3.
a/(a2-3a)+(a-8)/a+(7a2-3a-72)/(a3-9a)
помогите пожалуйста
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