2- Efetue as seguintes subtrações:
a) (+5/7) - (+2/3) =
e) (-2/5)-(-1/4) =
b) (+213) - (+1/2) =
) (-1/2)-(+5/8) =
g)(+2/3) -(+1/5) =
c) (+213) - (+4/5) =
h) (-2/5) - (+1/2)
d) (-7/8)-(-3/4) =
me ajudem pliz
Soluções para a tarefa
Resposta:a) 5/7 -2/3 = 15-14/21 = 1/21
e) -2/5 + 1/4= -8+5/20 = -3/20
b) 2/3 - 1/2 = 4 -12= -8/ -6 = - 4/3
f) -1/2 - 5/8 =-4-5/8 = -9/8
c)2/3 -4/5 =10-12/15 = -2/15
g) 2/3- 1/5 = 10-3/15 = 7/15
d)-7/8 + 3/4 = -7+6/8 = -1/8
h) -2/5- 1/2 =-4-5/10 = -9/10
Explicação passo-a-passo:não sei se ajudo mas ta ai =}
Oie, Td Bom?!
a)
= 5/7 - 2/3
= [5 . 3]/[7 . 3] - [2 . 7]/[3 . 7]
= 15/21 - 14/21
= [15 - 14]/21
= 1/21
e)
= - 2/5 - (- 1/4)
= - 2/5 + 1/4
= - [2 . 4]/[5 . 4] + [1 . 5]/[4 . 5]
= - 8/20 + 5/20
= [- 8 + 5]/20
= [- 3]/20
= - 3/20
b)
= 2/13 - 1/2
= [2 . 2]/[13 . 2] - [1 . 13]/[2 . 13]
= 4/26 - 13/26
= [4 - 13]/26
= [- 9]/26
= - 9/26
f)
= - 1/2 - 5/8
= - (1/2 + 5/8)
= - ([1 . 4]/[2 . 4] + 5/8)
= - (4/8 + 5/8)
= - [4 + 5]/8
= - 9/8
g)
= 2/3 - 1/5
= [2 . 5]/[3 . 5] - [1 . 3]/[5 . 3]
= 10/15 - 3/15
= [10 - 3]/15
= 7/15
c)
= 2/13 - 4/5
= [2 . 5]/[13 . 5] - [4 . 13]/[5 . 13]
= 10/65 - 52/65
= [10 - 52]/65
= [- 42]/65
= - 42/65
h)
= - 2/5 - 1/2
= - (2/5 + 1/2)
= - ([2 . 2]/[5 . 2] + [1 . 5]/[2 . 5])
= - (4/10 + 5/10
= - [4 + 5]/10
= - 9/10
d)
= - 7/8 - (- 3/4)
= - 7/8 + 3/4
= - 7/8 + [3 . 2]/[4 . 2]
= - 7/8 + 6/8
= [- 7 + 6]/8
= [- 1]/8
= - 1/8
Att. Makaveli1996