Ответ:

1.    z:= (b+sqrt(sqr(b)+4*a*c))/(2*a) - power(a,3)*c + power(b,-2);

3.   z:=(sin(x)+cos(y))/(cos(x)-sin(y))*tan(x)*y;

5.   z:= (3+exp(y-1))/(1+sqr(x)*abs(y-tan(x)));

7.    z:= ln(abs(y-sqrt(abs(x)) * (x- y/(x+sqr(x)/4)) ));