Question

tìm x\(\varepsilon\)z

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

b)\(\frac{2}{5}\)-(\(\frac{1}{5}\)+x ) =0,5

Answer 1

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

\(\frac{1}{4}:x=-\frac{23}{20}\)

\(x=-\frac{5}{23}\)

b) \(\frac{2}{5}-\left(\frac{1}{5}+x\right)=0,5\)

\(\frac{1}{5}+x=-\frac{1}{10}\)

\(x=-\frac{3}{10}\)

Answer 2

a) 3/4+1/4:x=2/-5

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

1/4:x=-23/20

x=1/4:-23/20

x=-5/23

b)2/5-(1/5+x)=0,5

2/5-(1/5+x)=1/2

1/5+x=2/5-1/2

1/5+x=-1/10

x=-1/10-1/5

x=-3/10

dấu / là dấu phân số