(1)
-5-3.5÷7/8×(-4/7)
=-5+7/2×8/7×4/7
=-5+16/7
=-19/7
(2)
-4-[1-(1-0.5×1/3)]×2-9
=-13-[1-(1-1/6)]×2-9
=-13-(1-1+1/6)×2
=-13-1/6×2
=-13-1/3
=-40/3