3) (a^2-b)/a -a= a-b/a -a= -b/a
-(-5)/0,2= 25
4) (3(x^2+3x)-x(x+15)-2(x^2-9))/x(x^2-9)= (3x^2+9x-x^2-15x-2x^2+18)/x(x^2-9)= -6(x-3)/x(x^2-9)= -6/x(x+3)
5) a) b любое
б) y любое
в) x неравен 0, -1, 2
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3) (a^2-b)/a -a= a-b/a -a= -b/a
-(-5)/0,2= 25
4) (3(x^2+3x)-x(x+15)-2(x^2-9))/x(x^2-9)= (3x^2+9x-x^2-15x-2x^2+18)/x(x^2-9)= -6(x-3)/x(x^2-9)= -6/x(x+3)
5) a) b любое
б) y любое
в) x неравен 0, -1, 2