Question

3/4+1/4:x=2/5

 

Answer 1

3/4 + 1/4 : x = 2/5

1/4 : x = 3/4 - 2/5

1/4 : x = 15/20 - 8/20

1/4 : x = 7/20

x = 1/4 : 7/20

x = 1/4 x 20/7

x = 5/7

Vậy x = 5/7

Answer 2

\(\frac{3}{4}+\frac{1}{4}:x=\frac{2}{5}\)

\(\frac{1}{4}:x=\frac{2}{5}-\frac{3}{4}\)

\(\frac{1}{4}:x=-\frac{7}{20}\)

\(x=\frac{1}{4}:\left(\frac{-7}{20}\right)\)

\(x=\frac{-5}{7}\)

Vậy \(x=\frac{-5}{7}\)

Answer 3

1/4:x=2/5-3/4

1/4:x=-7/20

x=5/7

Answer 4

x=-5/7(mình ghi nhầm)

Answer 5

x = -5/7

Answer 6

x= -5/7

Answer 7

x = -5/7

Answer 8

\(x=\frac{-5}{7}\)

Answer 9

3/4 + 1/4 : x = 2/5

1/4 : x = 2/5 - 3/4

1/4 : x = 8/20 - 15/20

1/4 : x = -7/20

x = 1/4 : (-7/20)

x = 1/4 . (-20/7)

x = -5/7

vậy x = -5/7

Answer 10

x=-5/7

Answer 11

\(\text{Ta có: 3/4 + 1/4 : x = 2/5 }\)
\(\Rightarrow\)\(\text{1/4 : x = 3/4 - 2/5 }\)

\(\Rightarrow\)\(\text{1/4 : x = 15/20 - 8/20}\)

\(\Rightarrow\)\(\text{1/4 : x = 7/20}\)

\(\Rightarrow\)\(\text{x = 1/4 : 7/20}\)
\(\Rightarrow\)\(\text{x = 1/4 x 20/7 }\)

\(\Rightarrow\) \(\text{x = 5/7​}\)

\(\text{Vậy x = 5/7 }\)

Answer 12

3/4 + 1/4 : x = 2/5

1/4 : x = 3/4 - 2/5

1/4 : x = 15/20 - 8/20

1/4 : x = 7/20

x = 1/4 : 7/20

x = 1/4 x 20/7

x = 5/7

Vậy x = 5/7