Bài 1)
$\dfrac{7}{4}$ $+$ $\dfrac{5}{6}:5$ $-$ $\dfrac{3}{8}.(-3)^2$
$=\dfrac{7}{4}$ $+$ $\dfrac{1}{6}$ $-$ $\dfrac{27}{8}$
$=\dfrac{84}{48}$ $+$ $\dfrac{8}{48}$ $-$ $\dfrac{162}{48}$
$=\dfrac{-35}{24}$
Bài 2)
$2^5x-2^3x+x=(5^5:5^2).2$
$x.(2^5-2^3+1)=250$
$x.25=250$
$x=250:25=10$