Question

-2(6,7b-0,5)+5,3b-2 при b=2/9​

Answer 1

Объяснение:

-2(6,7b-0,5)+5,3b-2=

= - 13,4b+1+5,3b-2=

= - 8,1b-1= - 8,1×2/9-1= - 8 1/10×2/9-1=

= - 81/10×2/9-1= - 9/5-1= - 1,8-1= - 2,8