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

- 0,52 : x = \(-\frac{4}{7}\)

\(x=\left(-0,52\right):\left(-\frac{4}{7}\right)=\frac{91}{100}=0,91\)

b) \(\frac{4\frac{1}{4}}{2\frac{7}{8}}=\frac{x}{1,61}\)

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

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

\(x=\frac{34}{23}.1,61=2,38\)

a, ta có:27:3,6=7,5

=>-2x7,5=15

vậy x cần tìm là 15

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

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

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

x=0,91

lớp 7 thì có

uk tui lộn

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

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

=>x.3,6=-54

=>x=-15

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

=>-0,52:x=-4/7

=>x=0,91

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

=>\(2\frac{7}{8}.x=4\frac{1}{4}.1,61\)

=>\(2\frac{7}{8}.x=\frac{2737}{400}\)

=>x=\(\frac{119}{50}\)

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

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

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

\(\Leftrightarrow x=-15\)

b,\(-0,52\div x=-9,36\div16,38\)

\(\Leftrightarrow-0,52\div x=-\frac{4}{7}\)

\(\Leftrightarrow x=\frac{91}{100}\)

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

\(\Leftrightarrow\frac{4,25}{2,875}=\frac{x}{1,61}\)

\(\Leftrightarrow x.2,875=4,25.1,61\)

\(\Leftrightarrow x.2,875=6,8425\)

\(\Leftrightarrow x=2,38\)

bạn ghi rõ đề câu b ra đi ạ

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

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

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

\(x=-15\)

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