Ответ:
1)a(x+y-z)/c(x+y-z)=a/c
2)(a-1)(a^2+a+b^2)/a^2+a+1=a-1
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Ответ:
1)a(x+y-z)/c(x+y-z)=a/c
2)(a-1)(a^2+a+b^2)/a^2+a+1=a-1