Question

[võ thị thanh vân]

tìm x

a)x:5/4=9/5+1/2

b)(x+3/4)*5/7=10/9

Answer 1

[Trần Huyền Trang]

a, x : \(\frac{5}{4}\) = \(\frac{9}{5}\) + \(\frac{1}{2}\)

x : \(\frac{5}{4}\) = \(\frac{23}{10}\)

x= \(\frac{23}{10}\) x \(\frac{5}{4}\)

x= \(\frac{23}{8}\)

c, ( x + \(\frac{3}{4}\) ) x \(\frac{5}{7}\) = \(\frac{10}{9}\)

x + \(\frac{3}{4}\) = \(\frac{10}{9}\) : \(\frac{5}{7}\)

x + \(\frac{3}{4}\) = \(\frac{14}{9}\)

x= \(\frac{14}{9}\) - \(\frac{3}{4}\)

x= \(\frac{56}{36}\) - \(\frac{27}{36}\)

x= \(\frac{29}{36}\)

Tk mk nha

Answer 2

[Park Jimin - Mai Thanh Hoa]

\(x:\frac{5}{4}=\frac{9}{5}+\frac{1}{2}\Leftrightarrow x:\frac{5}{4}=\frac{23}{10}\)

\(\Leftrightarrow x=\frac{23}{10}.\frac{5}{4}\Leftrightarrow x=\frac{23}{8}\)

\(\left(x+\frac{3}{4}\right).\frac{5}{7}=\frac{10}{9}\Leftrightarrow x+\frac{3}{4}=\frac{10}{9}:\frac{5}{7}\)

\(\Leftrightarrow x+\frac{3}{4}=\frac{14}{9}\Leftrightarrow x=\frac{14}{9}-\frac{3}{4}\Leftrightarrow x=\frac{29}{36}\)