Cách làm cho bạn:
a) $\frac{x}{26}=\frac{21}{39}$
x.39=26.21
x = 14
b) 4:5,2=x:27
x=$\frac{4.\frac{2}{7}}{5,2}$
x=$\frac{20}{91}$.
c)$\frac{1.25}{0.1x}=\frac{1.35}{0.2}$
0,1x . 1,35=1,25 . 0,2
x=$\frac{50}{27}$
d*)(3x−2):$\frac{7}{2}=\frac{4}{21}:\frac{1}{12}$
(3x−2).$\frac{2}{7}=\frac{4}{21}$.12
(3x−).$\frac{2}{7}=\frac{16}{7}$
(3x−2)=$\frac{16}{7}:\frac{2}{7}$
3x – 2 = 8
3x = 10
x=$\frac{10}{3}$.
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