3/4÷7/10=
1/5+ 1/3- 6/9×6/4+1/5÷1/4=
3/4-1/6+3/8=
-1/2+7/2=
{5/6-7/9+1/3-[2/7-(1/2÷4/8)-1/3]+3/4}-2(1/2)=
5/7+ 1/2- 6/9×3/2+1/5-4/10÷5/12-8/3=
3
-3373/1050
299/252
15/14
23/24
-31/60
