chép đúng đề bài ko ko có = à thì sao làm được

y:0,15 = ( 2,8 + 0,38 ) : 0,75

y:0,15=      3,18          : 0,75

y:0,15=                4,24

      y  =                4,24 *0,15

      y=                      0,636

* \(\dfrac{15}{12}:x=\left(\dfrac{5}{6}-\dfrac{1}{2}\right).\dfrac{5}{4}\)

\(\dfrac{15}{12}:x=\dfrac{1}{3}.\dfrac{5}{4}\)

\(\dfrac{15}{12}:x=\dfrac{5}{12}\)

\(x=\dfrac{15}{12}:\dfrac{5}{12}\)

\(x=3\)

* \(y:0,15=\left(2,8+0,38\right):0,75\)

\(y:0,15=3,18:0,75\)

\(y:15=4,24\)

\(y=4,24.15\)

\(y=63,6\)

ko biết đau kho quá

15/12 : y = ( 5/6 - 1/2 ) . 5/4 y : 0,15 = (2,8 + 0,38) : 0,75

15/12 : y = 1/3 . 5/4 y : 0,15 = 3,18 : 0,75

15/12 : y = 5/12 y : 0,15 = 4,24

y = 15/12 : 5/12 y = 4,24 . 0,15

y = 3 y = 0,636

a.x : 0,15 = (2,8 + 0,38) : 0,75

   x : 0,15 =3,18 : 0,75

   x : 0,15 = 4.24

   x          = 4,24 . 0,15

   x          = 0.636

b.5/12 : x = (5/6 - 1/2) . 5/4

   5/12 : x = 1/3 . 5/4 

   5/12 : x = 5/12

            x = 5/12 : 5/12 

            x = 1

a. \(\frac{5}{12}:x=\left(\frac{5}{6}-\frac{1}{2}\right)\times\frac{5}{4}\)

\(=>\)\(\frac{5}{12}:x=\frac{1}{3}\times\frac{5}{4}=\frac{5}{12}\)

\(=>x=\frac{5}{12}:\frac{5}{12}=1\)

b.\(x:0,15=\left(2,8+0,38\right):0,75\)

\(=>x:0,15=3,18:0,75=4,24\)

\(=>x=4,24\times0,15=0,636\)

d.\(4,75-x:0,5=2,98\)

\(=>x:0,5=4,75-2,98=1,77\)

\(=>x=1,77\times0,5=0,885\)

Sr nhá đề câu c mk ko hỉu lắm.

cau lay de qua di aaa

mình càn rất gấp

a/ \(\frac{5}{12}:y=\left(\frac{5}{6}-\frac{1}{2}\right)\cdot\frac{5}{4}\)
     \(\frac{5}{12}:y=\left(\frac{5-3}{6}\right)\cdot\frac{5}{4}\)
    \(\frac{5}{12}:y=\frac{2}{6}\cdot\frac{5}{4}\)
     \(\frac{5}{12}:y=\frac{5}{12}\)
             \(y=\frac{5}{12}:\frac{5}{12}\)
             \(y=1\)

b.  \(y:0,15=\left(2,8+0,38\right):0,75\)
    \(y:0,15=3,18:0,75=4,24\)
               \(y=4,24\cdot0,15\)
               \(y=0,636\)

Bài này cũng không phải dạng khó, bạn cố gắng học lên nhé
Chúc bạn thành công 

a) \(-\dfrac{3}{5}-x=-0,75\)

\(\Rightarrow-\dfrac{3}{5}-x=-\dfrac{3}{4}\)

\(\Rightarrow x=\dfrac{3}{4}-\dfrac{3}{5}\)

\(\Rightarrow x=\dfrac{15}{20}-\dfrac{12}{20}=\dfrac{8}{20}=\dfrac{2}{5}\)

b) \(1\dfrac{4}{5}=-0,15-x\)

\(\Rightarrow\dfrac{9}{5}=-\dfrac{3}{20}-x\)

\(\Rightarrow x=-\dfrac{3}{20}-\dfrac{9}{5}\)

\(\Rightarrow x=-\dfrac{3}{20}-\dfrac{36}{20}=-\dfrac{39}{20}\)

c) \(x+\dfrac{1}{3}=\dfrac{2}{5}-\left(-\dfrac{1}{3}\right)\)

\(\Rightarrow x+\dfrac{1}{3}=\dfrac{2}{5}+\dfrac{1}{3}\)

\(\Rightarrow x=\dfrac{2}{5}+\dfrac{1}{3}-\dfrac{1}{3}=\dfrac{2}{5}\)

a) \(-\dfrac{3}{5}-x=-0,75\)

\(x=-\dfrac{3}{5}+0,75=\dfrac{3}{5}+\dfrac{3}{4}\)

\(x=\dfrac{27}{20}\)

________

b) \(1\dfrac{4}{5}=-0,15-x\)

\(=>-0,15-x=\dfrac{9}{5}\)

\(x=\dfrac{-3}{20}-\dfrac{9}{5}=\dfrac{-3}{20}-\dfrac{36}{20}\)

\(x=\dfrac{-39}{20}\)

c) \(x+\dfrac{1}{3}=\dfrac{2}{5}-\left(-\dfrac{1}{3}\right)=\dfrac{6}{15}+\dfrac{5}{15}\)

\(x+\dfrac{1}{3}=\dfrac{11}{15}\)

\(x=\dfrac{11}{15}-\dfrac{1}{3}=\dfrac{11}{15}-\dfrac{5}{15}\)

\(x=\dfrac{6}{15}=\dfrac{2}{5}\)

Mik sửa lại câu a

\(...x=-\dfrac{3}{5}--0,75=\dfrac{-3}{5}+\dfrac{3}{4}\)

\(x=\dfrac{-12}{20}+\dfrac{15}{20}\)

\(x=\dfrac{3}{20}\)

\(y.3\dfrac{7}{12}=6\dfrac{1}{4}\)

\(y.\dfrac{43}{12}=\dfrac{25}{4}\)

\(y=\dfrac{25}{4}:\dfrac{43}{12}\)

\(y=\dfrac{25.12}{4.43}\)

\(y=\dfrac{75}{43}\)

Sai đề e ơi

Yx7/3=3/2

Y=7/3x3/2

Y=7/2

\(a,-\dfrac{3}{5}-x=-0,75\\ -\dfrac{3}{5}-x=-\dfrac{3}{4}\\ x=-\dfrac{3}{5}-\left(-\dfrac{3}{4}\right)\\ x=-\dfrac{3}{5}+\dfrac{3}{4}=\dfrac{3}{20}\\ ---\\ b,1\dfrac{4}{5}=-0,15-x\\ \dfrac{9}{5}=-\dfrac{3}{20}-x\\ x=-\dfrac{3}{20}-\dfrac{9}{5}\\ x=-\dfrac{3}{20}-\dfrac{36}{20}\\ x=-\dfrac{39}{20}\\ ----\\ c,2\dfrac{1}{2}-x+\dfrac{4}{5}=\dfrac{2}{3}-\left(-\dfrac{4}{7}\right)\\ \dfrac{5}{2}-x+\dfrac{4}{5}=\dfrac{2}{3}+\dfrac{4}{7}\\ \dfrac{33}{10}-x=\dfrac{26}{21}\\ x=\dfrac{33}{10}-\dfrac{26}{21}\\ x=\dfrac{433}{210}\)

1) 2,75 - 5/6 × 2/5 = 2,75 - (5/6) × (2/5) = 2,75 - 1/3 = 2,75 - 0,33 = 2,42

2) 1,25 - (5/6 - 0,75) - 3/5 = 1,25 - (5/6 - 0,75) - 3/5 = 1,25 - (5/6 - 3/4) - 3/5 = 1,25 - (5/6 - 9/12) - 3/5 = 1,25 - (10/12 - 9/12) - 3/5 = 1,25 - 1/12 - 3/5 = 1,25 - 0,08 - 0,6 = 1,25 - 0,68 = 0,57

3) 4/9 × 0,75 + 8/5 + 3,125 = (4/9) × 0,75 + 8/5 + 3,125 = 0,44 + 8/5 + 3,125 = 0,44 + 1,6 + 3,125 = 0,44 + 4,725 = 5,165

4) 1,125 - 4/7 - 0,12 = 1,125 - (4/7) - 0,12 = 1,125 - 0,57 - 0,12 = 0,435 - 0,12 = 0,315

5) (1/3 + 0,4) × 3,5 + (1/6 + 0,75) × 6/5