9分之5+11分之3+9分之4+11分之8
=5/9+4/9+3/11+8/11
=2
18分之7÷4+4分之3×18分之7
=7/18x1/4+3/4x7/18
=(1/4+3/4)x7/18
=7/18
4分之1-6分之1)×12
=1/4x12-1/6x12
=3-2
=1
9分之5+11分之3+9分之4+11分之8
=5/9+4/9+3/11+8/11
=2
18分之7÷4+4分之3×18分之7
=7/18x1/4+3/4x7/18
=(1/4+3/4)x7/18
=7/18
4分之1-6分之1)×12
=1/4x12-1/6x12
=3-2
=1