\(\frac{75}{x}=\frac{5}{3}\)

=> 75 : x = 5/3

            x = 75 : 5/3

            x = 45

Vậy x = 45

ủng hộ nhé

Ta có :

(x + 1) + (x + 2) + (x + 3) + (x + 4) + (x + 5) + (x + 6) = 75 

=) 6x + ( 1 + .... + 6 ) = 75

=) 6x + [ ( 1 + 6 ) x 6 / 2 ] = 75

=) 6x + 21 = 75

=) 6x = 75 - 21

=) 6x = 54

=) x = 54 : 6 

=) x = 9

Mình nhanh nhất nha 

x+1+x+2+x+3+x+4+x+5+x+6=75

x.6+(1+2+3+4+5+6)=75

x.6+21=75

x.6=75-21=54

x=54:6=9

75:(x+3)=5

(x+3)=75:5

(x+3)=15

x=15-3

x=12

x=12

tick nhéthuythumattrangvatoxinomatna

75/x=5/3

75:5=15

suy ra x=3x15=45

 \(\frac{75}{x}=\frac{5}{3}\)

=>\(75.3=5x\)

=>225=5x

=> x=45

tk ủng hộ

a) 26                  b) 13
c) 36;48;60      d) 5

a) 2.(x+4)+5=65

2.(x+4)=65-5

2.(x+4)=60

x+4=60:2

x+4=30

x=30-4=26

a) 6x + 15 = 75

6x = 75 - 15

6x = 60

x = 60 : 6

x = 10

b) x - 12 = (-27)

x = (-27) + 12

x = -15

c) 23 + (x - 5) : 4 = 3⁸ : 3⁵

23 + (x - 5) : 4 = 3³

23 + (x - 5) : 4 = 27

23 + (x - 5) = 27 x 4

23 + (x - 5) = 108

x - 5 = 108 - 23

x - 5 = 85

x = 85 + 5

x = 90

x=645

x-125x9=94

x-1125=94

x=94+1125=1219

a)x=645
b)x=1219
Tick cho mình nha Nguyễn Thị Bích
 

BÀi 1:

1: |x|=49

=>\(\left[\begin{array}{l}x=49\\ x=-49\end{array}\right.\)

2: |x|+3=7

=>|x|=7-3=4

=>\(\left[\begin{array}{l}x=4\\ x=-4\end{array}\right.\)

3: 13-|x|=9

=>|x|=13-9=4

=>x=4 hoặc x=-4

Bài 2:

1: 72<=|x|<=75

=>|x|∈{72;73;74;75}

=>x∈{72;-72;73;-73;74;-74;75;-75}

2: |x|<4

mà x nguyên

nên |x|∈{0;1;2;3}

=>x∈{0;1;-1;2;-2;3;-3}

3: 19<=|x|+5<=22

=>14<=|x|<=17

mà x nguyên

nên |x|∈{14;15;16;17}

=>x∈{14;-14;15;-15;16;-16;17;-17}