1-
a) 5/4+3/4=8/4=2
b) -6/5-5/7 =-42/35-25/35=-77/35
c)3/5-8/5=-5/5=-1
d) -14/35+25/35=11/35
2-
2/6 gastou
1-2/6=4/6 é o que sobrou
V*4/6 = 140
V= 140*6/4= R$ 210,00
3-
a) 15/6 * 2/5=30/30=1
b) 3/4*5/7*1/2= 15/56
c) -6/11 * 3/5 =-18/55
4-
a) ==> 60/22
b) ==> 5/17
c) ==> 8/39
5-
2/5 / 7/3
=(2/5) * (3/7) =6/35
6-
10/(2/4) = 10*4/2 = 20 plantas
