Question

[An Phong Dii]

Tìm x,y,z biết

a) x= 1/4 + 2/3

b) 7/z = 21/-39

c)4/8 = z /-10 = -7/x = y/24

d) x/3 = 2/3 + -1/7

e)z/9 = -16/36

Answer 1

[#Mon]

a, x=\(\dfrac{1}{4}+\dfrac{2}{3}\)

x=\(\dfrac{11}{12}\)

b, \(\dfrac{7}{z}=\dfrac{21}{-39}\)

\(hay\dfrac{7}{z}=\dfrac{-7}{13}\)

\(\Rightarrow z.\left(-7\right)=7.13\)

\(z.\left(-7\right)=91\)

\(z=91:\left(-7\right)\)

\(\Rightarrow z=-13\)