Question

por favor alguém sabe fazer os cálculos. com cálculos
a) 1/5.(-10/3)+2/7.(-35/6)=
b)3.(-1/3)+4.(-5/2)=
c) (-1/5).(+0,9)-(-10/7).(0,07)=
d) (-1).[1/2-(-1/5).(-3/2)]+(-2/7).(0,7)=
E) (-1,2).(-2,7+1,4)+4,3.(1-2,4)=

Answer 1

a) 1/5 [- 10/3] + 2/7 [- 35/6] =
1*-10/5*3 + 2*-35/7*6 =
-10/15 - 70/42 =   (MMC = 210)
[-10*42 - 70*15] : 210 =
[- 420 - 1050] : 210 =
1470/210 =
7

b) 3 [- 1/3] + 4 [- 5/2] =
-3/3 - 20/2 =
-1 - 10 =
-11

c) [- 1/5][0,9] - [- 10/7][0,07] =
[- 1/5][9/10] - [- 10/7][7/100] =
- 1*9/5*10 - [- 10*7/7*100] =
- 9/50 + 70/700 =
- 9/50 + 1/10 =  (MMC = 50)
[- 9 + 1*5] : 50 =
[- 9 + 5] : 50 =
- 4/50 =
- 2/25 

d) [-1][1/2 - (- 1/5)(- 3/2)] + [- 2/7][0,7] =
[- 1][1/2 - (- 1*-3/5*2)] + [- 2/7][7/10] =
[- 1][1/2 - 3/10] + [- 2*7/7*10] =
[- 1][1*5 - 3]/10 - 2/10 =
[- 1][2/10] - 2/10 =
- 2/10 - 2/10 =
- 4/10 =
- 2/5

E) (-1,2).(-2,7+1,4)+4,3.(1-2,4)=
[- 1,2][- 2,7 + 1,4] + [4,3][1 - 2,4] =
[- 12/10][- 27/10 + 14/10] + [43/10][1 - 24/10] =
[- 12/10][- 13/10] + [43/10][10/10 - 24/10] =
[- 12*- 13/10*10] + [43/10][- 14/10] =
- 25/100 + [43*-14/10*10] =
- 25/100 + 602/100 =
577/100