Question

если b = - $\frac{9}{13}$
-0,6(1,6b-5)-(2.9b-8)-4(4-1.5b) = ...

Answer 1

-0,6(1,6b-5)-(2.9b-8)-4(4-1.5b) = -0,96b+3-2,9b+8-16+6b=2,14b-5
2,14b-5=>2,1*(-9/13)-5=-189/130-5=-839/130=-6 59/130
проверить надо!!!!