me ajudem é pra hj plrmds
Soluções para a tarefa
Resposta:
https://youtu.be/SdunkWgD6v8
Explicação passo-a-passo:
ve esse vídeo no YouTube
espero ter ajudado
bjosss♥️
Resposta:
Explicação passo a passo:
1)
A)
4/7+2/7
= 6/7
________
B)
9/11-2/11
= 7/11
___________
C)
5/8 + 3/12 (:3)/(:3)
= 5/8 + 1/4
Mmc (4,8)= 8
= (1.5+2.1)/8
= (5+2)/8
= 7/8
__________
D)
5/8 + 1/15
Mmc (8,15)= 120
= (15.5 + 8.1)/120
= (75+8)/120
= 83/120
___________
E)
2/3 + 1/2 - 1/6
Mmc (3,2,6)= 6
= (2.2 + 3.1 - 1)/6
= (4+3-1)/6
= (7-1)/6
= 6/6
= 1
_______
F)
5+2/3
= (3.5+2)/3
= (15+2)/3
= 17/3
___________
G)
1/24 + 5/36 + 1/42
Mmc = 504
= (21.1 + 14.5 + 12.1)/504
= (21+70+12)/504
= 103/504
R.: = 103/504
____________
Mmc:
24,36,42: 2
12, 18, 21: 2
6, 9, 21: 2
3, 9, 21: 3
1, 3, 7: 3
1, 1, 7: 7
1, 1, 1
= 2^3 . 3^2 . 7
= 8 . 9 . 7
= 504
_______________
H)
7/36 + 5/42 + 1/60
Mmc = 1260
= (35.7 + 30.5 + 21.1)1260
= (245+150+21)/1260
= 416/1260 (:4)/(:4)
= 104/315
R.: = 104/315
___________
Obs.: Mmc
36,42,60: 2
18, 21, 30: 2
9, 21, 15 : 3
3, 7, 5: 3
1, 7, 5: 5
1, 7, 1: 7
1, 1, 1
= 2^2 . 3^2 . 5 . 7
= 4 . 9 . 35
= 36 . 35
= 1260
__________
2)
A)
5/3 . 2/7
= 10/21
__________
B)
5/3 ÷ 2/7
= 5/3 . 7/2
= 35/6
_________
C)
49/15 . 25/14 . 6/35
= 49/14 . 25/15 (:5)/(:5) . 6/35
= 49/14 (:7)/(:7) . 5/3 . 6/35
= 7/2 . 5/3 . 6/35
= 7/35 (:7)/(:7) . 6/3 . 5/2
= 1/5 . 2. 5/2
= 5/5 . 2/2
= 1.1
= 1
__________
D)
3 ÷ 4/3
= 3 . 3/4
= 9/4
_________
E)
2/3 ÷ 6
= 2/3 . 1/6
= 2/18 (:2)/(:2)
= 1/9
__________
F)
3/5÷1/3
= 3/5 . 3
= 9/5
==========
G)
8 + 1.3/5
= 8 + 3/5
= (5.8+3)/5
= (40+3)/5
= 43/5
_________
H)
7 - 3.(5/6 - 2/3)
= 7 - 15/6 (:3)/(:3) + 6/3
= 7 - 5/2 + 2
= 9 - 5/2
= (2.9 - 5)/2
= (18 - 5)/2
= 13/2
___________
3)
A)
(1/5)^2 = 1/25
_________
B)
(4/7)^2
= 4/7 . 4/7
= 16/49
_________
C)
(5/6)^3
= 5/6 . 5/6 . 5/6
= 125/216
________
D)
(3/8)^3
= 3/8 . 3/8 . 3/8
= 27/512
__________