Question

решите пожалуйста! всё по действиям

Answer 1

2×2/13-(7×2/13(-3×2/13+(2-5×2/13)))=4/13-14/13-6/13+(2-10/13)))=-16/13+( 26/13-10/13)))=-16/13+16/13=0

Answer 2

$2b-(7b-(-3b+(2-5b)))=2b-(7b-(-3b+2-5b))= \\ \\ 2b-(7b-(-8b+2))= 2b-(7b+8b-2))= \\ \\ 2b-(15b-2))=2b-15b+2=-13b+2= \\ \\ -13* \frac{2}{13}+2=-2+2=0$