Question

①4分之1十5分之1÷4分之1+5分之1，②9分之4x5分之3÷9分之4x5分之3③12÷(3分之？

1+6分之1)

Answer 1

①4分之1十5分之1÷4分之1+5分之1
=1/4+1/5x4+1/5
=1/4+4/5+1/5
=1/4+1
=1又4分之1 或5/4
②9分之4x5分之3÷9分之4x5分之3
=(4/9÷4/9)x(3/5x3/5)
=1x9/25
=9/25
③12÷(3分之1+6分之1)
=12÷(2/6+1/6)
=12÷3/6
=24

Answer 2

①4分之1十5分之1÷4分之1+5分之1
=1/4+1/5 x4+1/5
=1/4+4/5+1/5
=1又1/4
②9分之4x5分之3÷9分之4x5分之3
=4/9 x 3/5 x 9/4 x3/5
=9/25
③12÷(3分之1+6分之1)
=12÷（2/6+1/6）
=12x2
=24

Answer 3

第一个等于1/4+1/5×4+1/5＝1/4+4/5+1/5＝5/4