Question

4-7x^2/2-x + 6x^2/2-x
при x=-3/4

Answer 1

(4-7x^2)/(2-x)-(6x^2)/(2-x)=(4-7x^2-6x^2)/(2-x)=-(13x^2-4)/-(x-2)=(13x^2-4)/(x-2)
при x=-3/4        (13*9/16-4)/(-3/4-2)=(117/16-4)/(-2.75)=(7 целых 5/16-4)/(-2.75)= (53/16)/(-275/100)=-53/44