9 + 9 + 9 + 9 + 9 + 9 + 6 + 6 + 6 + 6 + 2 + 2 + 23 + 3 + 3 + 4 + 4 + 4 = 123
3 + 4 + 2 + 8 + 6 + 0.3 + 4 + 2 + 8 + 6 + 0.3 + 4 + 2 = 49.6
2 + 3 + 4 + 5 + 6 = 20
6+4+3=2 when it is a mistake
10
-6=-6(-a+2)+3(a-4)
9 + 9 + 9 + 9 + 9 + 9 + 6 + 6 + 6 + 6 + 2 + 2 + 23 + 3 + 3 + 4 + 4 + 4 = 123
3 + 4 + 2 + 8 + 6 + 0.3 + 4 + 2 + 8 + 6 + 0.3 + 4 + 2 = 49.6
2 + 3 + 4 + 5 + 6 = 20
6+4+3=2 when it is a mistake
2+4+(-3)+(-4) 2+4=6 6+(-3)+(-4)=-1 -3+-4=-7 or 2+4+(-3)+4-4 2+4=6 4-4=0 +(-3)=-3 6-3=3
-3 + 4 - 6 + 3 - 2 + 42 = 1 - 6 + 3 - 2 + 42 = - 5 + 3 - 2 + 42 = - 2 - 2 + 42 = - 4 + 42 = 38
2 + 3 - 4 + 7 = -6
4/6 = 2/3; therefore, 2/3 + 4/6 = 4/3.
10
1 + 2 + 3 + 4 + 5 + 6 + 100 = 121
43