1. If a > b, E > F, C > 0, then F-AC < e-bc

1. If a > b, E > F, C > 0, then F-AC < e-bc

If a > b, C > 0,
Then AC > BC, - AC < - BC
If e > F, then f < E
Then - AC + F < - BC + e
F-AC < e-bc