5 + 6 + 2 + 1 = 14
One plus one is two. It can be expressed mathematically as 1+1 = 2.
5
1 + 5 - 2 + 256576567788 = 256576567792
1 multiplied by 5 plus 2 equals 7. This is because you are multiplying 1 into 5 and then adding 2.
3 + 5 + 6 + 9 + 2 + 1 + 10 = 36
5
(n2 + n)/2 1+2+3+4+5+n= 15+n
It is: -9+8+(-5)+3+1 = -2
1 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 46
2/5 + 1/5 = 3/5
1 1/2 plus 4 2/3 equals 5 3/5.