Răspuns:
a. 1,8(3)+(-5,2+5 supra 6)+[0,41(6)+(-2)]
1,8(3)+(-5,2+5/6)+[0,41(6)+(-2)]
=(183-18)/90+(-52/10+5/6)+[(416-41)/900-2]
=165/90+(26/5+5/6)+(375/900-2)
=55/30+(26×6/30+5×5/30)+(125/300-2)
=55/30+(156+25)/30+(125-600)/300
=55/30+181/30-475/300
=236/30-475/300
=(2360-475)/300
=1885/300
=377/60
=6,28(3)
b. -13 supra 24+[(+11 supra 36)+(-1 supra 48)]+7 supra 40
=-13/24+(11/36-1/48)+7/40
=-13/24+[(11×4)/144-3/144]+7/40
=-13/24+(44-3)/144+7/40
=-13/24+41/144+7/40
=(13×5+7×3)/120+41/144
=(65+21)/120+41/144
=86/120+41/144
=(86×12+41×10)/144×10
=(1032+410)/1440
=1442/1440
=1,0013888889
c. [(-24 supra 35)+(-1 întreg 3 supra 14)]+[-1+(-16 supra 15)+189 supra 45)
=[-24/15-(1×14+3)/14]+(-1-16/15+189/45)
=(-8/5-17/14)+(-1-16/15+21/5)
=(-8×14-17×5)/70+(-15-16+3×21)/15
=(-112-85)/70+(-31+63)/15
=-197/70+32/15
=(-3×197+14×32)/14×15
=(-591+448)/210
=-143/210
=-0,680952381
