Explicație pas cu pas:
1. (5+203):2+[230-(76+9)]
=208:2+(230-85)
=208:2+145
=104+145
=942
2. [(51+43):2]×31+17-(125+7)
=(49:2)×31+17-132
=24.5×31+17-132
=759.5+17-132
=644.5
3. 170:10+729:9-[25×(39-38)]
17+81-(25×1)
17+81-25
98-25
78
4.31+32×450-(39×6:2)+8
=31+32×450-117+8
=31+13400-177+8
=13431-144+8
=13,295
5.(31-21):10+(10+40)
=10:10+(10+40)
=1+50
=51
