Question

Bài tập: Tìm x, biết:

A. x/-15 = - 60 / 3

B. 10/x = -30/-60

C. 5/3 = x/9

Answer 1

a, \(\dfrac{x}{-15}=\dfrac{-60}{3}\)

=> x= \(\dfrac{-60.-15}{3}=300\)

b, \(\dfrac{10}{x}=\dfrac{-30}{-60}\)

=> x= \(\dfrac{10.-60}{-30}=20\)

c, \(\dfrac{5}{3}=\dfrac{x}{9}\)

=> \(x=\dfrac{5.9}{3}=15\)

Answer 2

A, x/-15= - 60/3

=> x.3 = -15.(-60)

x.3 = 900

x = 900 : 3

x = 300

Vậy x = 300

B, 10/x = -30/-60

=> x.(-30) = 10.(-60)

x.(-30) = -600

x = -600 : (-30)

x = 20

Vậy x = 20

C, 5/3 = x/9

=> 5.9 = 3.x

45 = 3.x

3.x = 45

x = 45 : 3

x = 15

Vậy x = 15