Six out of seven / five out of nine * equals seven out of eight
=6 out of 7 * 9 out of 5 * 7 out of 8
=54 out of 35 * 7 out of 8
=27 out of 20
=1 and 7 / 20
1 2 3 4 5 6 7 8 9 = 100 with two "-" and a "+" and a bracket, do not change the numerical order, 100
(123-45)-67+89=100
Only two minus signs, one plus sign and one bracket are allowed, and the numerical order is not changed: 1 2 3 4 5 6 8 9 = 100
123-45-67+89=100