Question

resolva as igualdades e equaçoes e calcule

a)x+145=100
b)4182÷x=34
c)5·x+65=700
d)7·x-90=491
e)6·x+64=100
f)5·x+12=32
g)8·x-15=25
h)x÷7=34
i)4·x+68=100
j)19·x-645=267
k)400-7·x=274
L)2889÷x=321
m)8x÷23=16
n)45·x=360
o)360÷x=45
p)12·x+56=200
q)75·x-75=1650

obs:o · significa vezes e o x significa que tem que descobrir o numero.




porfavor sem graçinhas eu preciso dessa tarefa pq é atividade avaliativa

Answer 1

a) x + 145 = 100
x = 100 - 145 = -45

b) 4182÷x = 34
4182 = 34x
x = 4182/34
x = 123

c) 5x + 65 = 700
5x = 700 - 65
x = 635/5
x= 127

d) 7x -90 = 491
7x = 491 + 90
7x = 581
x = 581/7
x= 83

e) 6x + 64 = 100
6x = 100 - 64
x = 36/6
x = 6

f) 5x + 12 = 32
5x = 32 -12
5x = 20
x = 20/5
x = 4

g) 8x -15 = 25
8x = 25+15
8x = 40
x = 5

h) x/7 = 34
x = 34.7
x = 148

i) 4x + 68 = 100
4x = 100-68
4x = 32
x = 32/4
x = 8

j) 19x - 645 = 267
19x = 267 + 645
19x = 912
x = 912/12
x = 76

k) 400 - 7x = 274
-7x = 274 - 400
-7x = 126
x = -18

l) 2889/x = 321
2889/321= x
x=9

m) 8x /23 = 16
8x = 16.23
8x = 368
x = 368/8
x = 46

n) 45x = 360
x = 360/45
x = 8

o)  360/x = 45
x = 360/45
x = 8

p) 12x + 56 = 200
12x = 200 - 56
12x = 144
x = 144/12
x = 12

q) 75x -75 = 1650
75x = 1650 + 75
x = 1725/75
x = 23