Question

tim x:

-3x-(-24)=-45

x/7=-6/21

Answer 1

-3x-(-24)=-45

- 3x + 24 = -45

- 3x =-45-24

- 3x =-69

x= 69:3

x= 23

Vậy...

Answer 2

\(\frac{x}{7}\)= \(-\frac{6}{21}\)

=> 21 x = -6.7

21x = -42

x= -42:21

x= -2

Vậy...

Answer 3

\(\frac{x}{7}=-\frac{6}{21}\)

\(\Leftrightarrow x.21=7.\left(-6\right)\)

\(\Leftrightarrow x.21=-42\)

\(\Leftrightarrow x=-2\)

Answer 4

-3x-(-24)=-45

-3x+24=-45

-3=-45-24

-3x=-69

x=-69:(-3)

x=23

x/7=-6/21

x*3/7*3=-6/21

x*3/21=-6/21

x*3=-6

x=-6:3

x=-2

Answer 5

\(-3x-\left(-24\right)=-45\)

\(-3x+24=-45\)

\(-3x=-69\)

\(x=23\)

Answer 6

\(\frac{x}{7}=-\frac{6}{21}\)

\(\Leftrightarrow x.21=-6.7\)

\(\Leftrightarrow x.21=-42\)

\(\Leftrightarrow x=-2\)