Explicație pas cu pas:
2:2+2x2-2= 1+4-2=5-2=3
3+3x3+3:3-3= 3+9+1-3= 12+1-3=13-3=10
4x4-4:4+4= 16-1+4= 15+4= 19
5-5:5+5x5= 5-1+25= 4+25= 29
6:6+6x6-6= 1+36-6= 37-6= 31
7-7:7+7x7= 7-1+48= 6+48= 55
8-8:8+8x8= 8-1+64= 7+64= 71
9:9+9×9-9= 1+81-9= 82-9= 73
10-10:10+10x10= 10-1+100= 9+100= 109