How can 123456789 be equal to 100 only by addition and subtraction?

How can 123456789 be equal to 100 only by addition and subtraction?

1+2+34-5+67-8+9=100 12+3-4+5+67+8+9=100 123-4-5-6-7+8-9=100 123+4-5+67-89=100 123+45-67+8-9=100 123-45-67+89=100 12-3-4+5-6+7+89=100 12+3+4+5-6-7+89=100 1+23-4+5+6+78-9=100 1+23-4+56+7+8+9=100 1+2+3-4+5+6+78+9=100 98-76+54+3+21=100 9-8+76+54-32+1=100 98+7+6-5-4-3+2-1=100 98-7-6-5-4+3+21=100 9-8+76-5+4+3+21=100 98-7+6+5+4-3-2-1=100 98+7-6+5-4+3-2-1=100 98+7-6+5-4-3+2+1=100 98-7+6+5-4+3-2+1=100 98-7+6-5+4+3+2-1=100 98+7-6-5+4+3-2-1=100 98-7-6+5+4+3+2+1=100 9+8+76+5+4-3+2-1=100 9+8+76+5-4+3+2+1=100 9-8+7+65-4+32-1=100