Question

fração
1)
a)9/4+7/4-6/4=
b)3/8-6/8=
c) 5/4-1/2
d) 9/15-4/10+4
2)
a) (-5/8).(4/3)=
b) (-7/5).(5/6).(-1/3
c) (-4).(2/14).(14/7)=
d) (1/9):(3/12)=
e) (-4/5):(4/10)=

3)sendo x=-4/3 e y 12/7, qual é o valor de x.y

Answer 1

1)
a)9/4+7/4-6/4=
16/4 -6/4
10/4 (÷2)
5/2

b)3/8-6/8=
3/8

c) 5/4-1/2=
5/4 - 2/4
3/4

d) 9/15-4/10+4=
MMC de 15 e 10 e 1 = 30
18/30 - 12/30 + 120/30
6/30 + 120/30
126/30 (÷6)
21/5

2)
a) (-5/8).(4/3)=
(-5/8) * 4/3
-20/24 (÷4)
-5/6

b) (-7/5).(5/6).(-1/3)=
(-7/5) * 5/6 * (-1/3)
(-35/30) * (-1/3)
35/90 (÷5)
7/18

c) (-4).(2/14).(14/7)=
(-4) * 2/14 * 14/7
(-4) * 28/98
-112/98 (÷14)
-8/7

d) (1/9):(3/12)=
1/9 * 12/3
12/27 (÷3)
4/9

e) (-4/5):(4/10)=
-4/5 * 10/4
-40/20
-2

3)x=-4/3 e y 12/7

x.y =
-4/3 * 12/7
-48/21 (÷3)
-16/7