25 баллов (математика)

Question

25 баллов (математика)

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Answer 1

9
(x+3)/[(x-1)(x+1)]-1/[x(x+1)]=(x²+3x-x+1)/[x(x-1)(x+1)]=
=(x²+2x+1)/[x(x-1)(x+1)]=(x+1)²/[x(x-1)(x+1)]=(x=1)/[x(x-1)]
2)(x+1)/[x(x-1)]*x(x-1)/[3(x+1)]=1/3
10
4-2x+5=--3x
3x-2x=3-9
x=-6