Đáp án:
$\text{ d) $\dfrac{-7}{9}$ . $\dfrac{3}{11}$ + (-$\dfrac{7}{9}$ ) . $\dfrac{8}{11}$ + 1$\dfrac{7}{9}$}$
$\text{ = $\dfrac{-7}{9}$ . $\dfrac{3}{11}$ + (-$\dfrac{7}{9}$) . $\dfrac{8}{11}$ + $\dfrac{16}{9}$ }$
$\text{ = $\dfrac{-7}{9}$ .( $\dfrac{3}{11}$ + $\dfrac{8}{11}$ ) + $\dfrac{16}{9}$ }$
$\text{ = $\dfrac{-7}{9}$ + $\dfrac{16}{9}$}$
$\text{ = 1 }$
$\text{ e) $\dfrac{7}{35}$ . $\dfrac{10}{19}$ + $\dfrac{7}{35}$ . $\dfrac{9}{19}$ - $\dfrac{2}{35}$ }$
$\text{ = $\dfrac{7}{35}$ . ($\dfrac{10}{19}$ + $\dfrac{9}{19}$) - $\dfrac{2}{35}$ }$
$\text{ = $\dfrac{7}{35}$ . 1 -$\dfrac{2}{35}$ }$
$\text{ = $\dfrac{1}{7}$ }$
$\text{ f (-25) . 125 . 4 . (-8) . (-17) }$
$\text{ = [ (-25) . 4] . [ 125 . (-8) ] . (-17) }$
$\text{ = -100 . (-1000) . (-17) }$
$\text{ = -1700000 }$
$\text{ g , $\dfrac{-3}{4}$ + $\dfrac{2}{7}$ + (-$\dfrac{1}{4}$) + $\dfrac{3}{5}$ + $\dfrac{5}{7}$ }$
$\text{ = ( $\dfrac{-3}{4}$ - $\dfrac{1}{4}$) + ($\dfrac{2}{7}$ + $\dfrac{5}{7}$) + $\dfrac{3}{5}$ }$
$\text{ = -1 + 1 + $\dfrac{3}{5}$ }$
$\text{ = 0 + $\dfrac{3}{5}$ }$
$\text{ = $\dfrac{3}{5}$ }$
