Question

tìm x ϵ Q , biết rằng:

a) \(\frac{11}{12}-\left(\frac{2}{5}+x\right)=\frac{2}{3}\)                    B) \(\frac{3}{4}+\frac{1}{4}:x=\frac{2}{3}\)

Answer 1

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

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

\(\frac{1}{4}:x=\frac{-1}{12}\)

\(x=\frac{1}{4}.\left(-12\right)\)

\(x=-3\)

Answer 2

mk lộn ý b

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

1/4:x = -1/12

x = -1/12:1/4

x=-3

Answer 3

a)\(\frac{11}{12}-\left(\frac{2}{5}+x\right)=\frac{2}{3}\)

\(\frac{2}{5}+x=\frac{2}{3}-\frac{11}{12}\)

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

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

\(x=\frac{-13}{20}\)

Answer 4

a. 11/12 - (2/5+x)= 2/3 
-(2/5+x) = 2/3 - 11/12 
-2/5 - x = -1/4 
-x = -1/4 + 2/5 
x = -3/20 

b.3/4 + 1/4 : x = 2/5 
1/4 : x = -7/20 
x = 1/4 : -7/20 
x = -5/7