Question

5 1/4 × 1 9/10-5 1/4 × 4 9/10

Answer 1

$5 \frac{1}{4} *1 \frac{9}{10} -5 \frac{1}{4} *4 \frac{9}{10} =5 \frac{1}{4} *(1 \frac{9}{10} -4 \frac{9}{10} )= \frac{21}{4} *( \frac{19}{10} - \frac{49}{10} )= \frac{21}{4} *(- \frac{30}{10} )=$
$- \frac{21}{4} *3=- \frac{63}{4} =-15 \frac{3}{4} =-15,75$

Answer 2

Вот Вам пожалуйста: