13+49:{[36+50]:2-[2x(8+18)-(48:3)]}=20
1) 8+18=26
2) 48:3=16
3) 36+50=86
4) 2×26=52
5) 52-16=36
6) 86:2=43
7) 43-36=7
8) 49:7=7
9) 13+7=20
Răspuns:
20
Explicație pas cu pas:
13 + 49 : {(36 + 50) : 2 - [2 · (8 + 18) - (48 : 3)]} =
= 13 + 49 : [86 : 2 - (2 · 26 - 16)] =
= 13 + 49 : [43 - (52 - 16)] =
= 13 + 49 : (43 - 36) =
= 13 + 49 : 7 =
= 13 + 7 =
= 20
