a,x/27=-2/3,6                      b,-0,52:x=-9,36:16,38

=)) x.3,6=27.(-2)                     -0,52:x=-4/7

=)) x.3,6=-54                            x=-0,52:(-4/7)

=)) x=-15                                   x=0,91

a) \(\dfrac{x}{27}=\dfrac{-2}{3,6}\)

=> x. 3,6 = 27. (-2)

=> x.3,6 = -54

x = (-54) : 3,6

x = -15

b) -0,52 : x = -9,36 : 16,38

- 0,52 : x = \(\dfrac{-4}{7}\)

x = \(\dfrac{-4}{7}\) . ( -0,52)

x = \(\dfrac{52}{175}\)

Lời giải:

a)

b)

-0,52 : x = -9,36: 16,38 => -0,52 . 16,38 = x. (-9,36) => x = -8,5176: ( -9,36) => x = 0,91

c)

a)\(\dfrac{x}{27}=\dfrac{-2}{3,6}\)

=>x.3,6=27.(-2)

=>x . 3,6=-54

=>x=-54:3.6

=>x=-54:\(\dfrac{18}{5}\)

=>x=-54.\(\dfrac{5}{18}\)

=>x=-15

b)-0,52:x=-9,36:16,38

-\(\dfrac{13}{25}:x=-\dfrac{234}{25}:\dfrac{819}{50}\)

\(-\dfrac{13}{25}:x=-\dfrac{4}{7}\)

\(x=-\dfrac{4}{7}:\left(-\dfrac{13}{25}\right)\)

x=\(\dfrac{52}{175}\)

c)\(\dfrac{4\dfrac{1}{4}}{2\dfrac{7}{8}}=\dfrac{x}{1,61}\)

\(\dfrac{\dfrac{17}{4}}{\dfrac{23}{8}}=\dfrac{x}{1,61}\)

\(\dfrac{17}{4}:\dfrac{23}{8}=\dfrac{x}{1,61}\)

\(\dfrac{17}{4}.\dfrac{8}{23}=\dfrac{x}{1,61}\)

\(\dfrac{34}{23}=\dfrac{x}{1,61}\)

=>34.1,61=x.23

rồi bạn tự tính tự làm nốt nhé

a) \(\frac{x}{27}=\frac{-2}{3,6}\Rightarrow x=\frac{-2\cdot27}{3,6}=-15\)

b) \(-0,52:x=-9,36:16,38\Rightarrow x=\frac{-0,52\cdot16,38}{-9,36}=0,91\)

c) \(\frac{4\frac{1}{4}}{2\frac{7}{8}}=\frac{x}{1,61}\Rightarrow x=\frac{4\frac{1}{4}\cdot1,61}{2\frac{7}{8}}=2,38\)

bạn ghi rõ đề câu b ra đi ạ

a)\(\dfrac{x}{27}=-\dfrac{2}{3,6}\)

\(\Rightarrow\)\(3,6x=27.(-2)\)

\(\Leftrightarrow\)\(3,6x=54\)

\(x=-15\)

-0,52:x=-9,36

-0,52:x=-4/7

x=-0,52:-4/7

x=0.91