(3-5-2)/12除以7/25=(-1/3)*25/7=-25/21
2....(4/9)/((4/5)-2/5+1/3)=(4/9)/(2/5+1/3)=10/9+12/9=22/9
﹙1/4-5/12-1/6)÷7/25
=﹙3/12-5/12-2/12)÷7/25
=-4/12÷7/25
=-1/3×25/7
=-25/21
(4/9)÷(4/5)-2/5+1/3
=4/9×5/4+3/9-2/5
=5/9+3/9-2/5
=8/9-2/5
=40/45-18/45
=22/45
不知道你问的题目可是下面的列式?
(1/4-5/12-1/6)÷7/25=-1/3÷7/25=-25/21
4/9÷4/5-2/5+1/3=5/9-2/5+1/3=22/45
=九分之五减五分之二减三分之一 = 九分之五减五分之二减九分之三 = 九分之二减五分之二 =...负四十五分之八...