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Скороти дріб. а) 〖25ax〗^2/(〖75a〗^8 x) = x/〖3a〗^7 ; б) 125cm/(50c^3 m) = 5/2c; в) (3xc(x-2c))/(xc(x-2c)) = 3. г) ((a- n)(a+ n))/〖(a- n)〗^2 = (a+ n)/(a- n); ґ) (a(x+ y- z))/(c(x+ y- z)) = a/c; д) ((a-1) 〖(a〗^2+ a+1))/(a^2+ a+1) = a – 1.