We can only use two plus signs and two minus signs to work out the following formula: 1 2 3 4 5 6 7 8 9 = 100

We can only use two plus signs and two minus signs to work out the following formula: 1 2 3 4 5 6 7 8 9 = 100

123+45-67+8-9=100
Do you have anything else to start with