((- 1 1/2+ 2 2/3): 3 3/4-2/5):(-8 8/9)+1/4

Question

((- 1 1/2+ 2 2/3): 3 3/4-2/5):(-8 8/9)+1/4

Answer 1

((-1 1/2+2 2/3):3 3/4-2/5):(-8 8/9)+1/4=((-3/2+8/3):15/4-2/5):(-80/9)+1/4=
=((-9/6+16/6):15/4-2/5):(-80/9)+1/4=(7/6 · 4/15-2/5):(-80/9)+1/4=(14/45-2/5):
:(-80/9)+1/4=(14/45-18/45):(-80/9)+1/4=-4/45 · (-9/80)+1/4=1/100+1/4=0,01+
+0,25=0,26