(27分之4+36分之5)÷9分之5
=4/27x9/5+5/36x9/5
=4/15+1/4
=16/60+15/60
=31/60
5分之49×8分之7÷7
=49/5x(7/8x1/7)
=49/5x1/8
=49/40
13÷【(1+3分之1)×4分之3】
=13÷(4/3x3/4)
=13÷1
=13
(27分之4+36分之5)÷9分之5
=4/27x9/5+5/36x9/5
=4/15+1/4
=16/60+15/60
=31/60
5分之49×8分之7÷7
=49/5x(7/8x1/7)
=49/5x1/8
=49/40
13÷【(1+3分之1)×4分之3】
=13÷(4/3x3/4)
=13÷1
=13