7分之12÷(3分之2-4分之1)
=7/12×12÷(2/3×12-1/4×12)
=7÷(8-3)
=7÷5
=1.4
(8分之3+3分之2)÷24分之1
=(3/8+2/3)×24
=3/8×24+2/3×24
=9+16
=25
9分之11×3.8-3.8×9分之2
=3.8×(11/9-2/9)
=3.8×1
=3.8
7分之3÷11分之7+7分之4÷11分之7
=(3/7+4/7)÷7/11
=1÷7/11
=11/7
7分之12÷(3分之2-4分之1)
=7/12×12÷(2/3×12-1/4×12)
=7÷(8-3)
=7÷5
=1.4
(8分之3+3分之2)÷24分之1
=(3/8+2/3)×24
=3/8×24+2/3×24
=9+16
=25
9分之11×3.8-3.8×9分之2
=3.8×(11/9-2/9)
=3.8×1
=3.8
7分之3÷11分之7+7分之4÷11分之7
=(3/7+4/7)÷7/11
=1÷7/11
=11/7