(4分之13-9分之17)×7分之9簡算

(4分之13-9分之17)×7分之9簡算

(4分之13-9分之17)×7分之9
=[1+9/4-(1+8/9)]*9/7
=[9/4-8/9]*9/7
=9/4*9/7-8/9*9/7
=81/28-8/7
=81/28-32/28
=49/28
=7/4