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20 ÷ 2 + {5 × 3 -[(63 ÷ 7 - 1)+ 1]- 5 }+ 2 plus repede


Răspuns :

20:2+{5×3-[(63:7-1)+1]-5}+2=13

20:2=10

5×3=15

63:7=9

9-1=8

8+1=9

15-9=6

6-5=1

10+1=11

11+2=13
20:2+{5×3-[9-1)+1]-5}+2
20:2+[5×3-(8+1)-5]+2
20:2+[5×3-9-5]+2
20:2+[15-9-5)+2
20:2+(6-5)+2
20:2+1+2
10+1+2=13