Помогите упростить вырожение!!!! все во вложениях!! 

1_1/6 +1_5/6 * (1.854 :1.8 - 1.5 * 2.02)=7/6+11/6 *( 1.03 - 3.03 )=7/6+11/6 * (-2) =7/6 - 22/6 =- 15/6 = - 2.5Упростите(z - 2) /(2z+4) + (2z +1) /(3z -4)=[(z - 2)(3z-4) +(2z+4)(2z +1)] / [(3z -4)(2z+4)]=[3z^2 +8-6z-4z +4z^2+8z+2z +4] / [(3z -4)(2z+4)]=(7z^2 +12 ) / [(3z -4)(2z+4)]

[latex] frac{z+2}{2z+4}+ frac{2z+1}{3z-4} = frac{(z+2)(3z-4)+(2z+1)(2z+4)}{(2z+4)(3z-4)}= frac{3z^2-4z+6z-8+4z^2+8z+2z+4}{6z^2-8z+12z-16}= \ = frac{7z^2+12z-4}{6z^2+4z-16}[/latex]