Question

Упростите выражение: 1) 2/5 x + 4/7 x - 5/14 x 2) 7/12 y - 3/16 y + 5/24 y

Answer 1

$1) \frac{2}{5}x+ \frac{4}{7}x- \frac{5}{14}x = \frac{2*14}{5*14}x+ \frac{4*10}{7*10}x- \frac{5*5}{14*5}x=$$\frac{28}{70}x+ \frac{40}{70}x- \frac{25}{70}x= \frac{28+40-25}{70} x= \frac{43}{70}x$


$\frac{7}{12}y- \frac{3}{16}y+ \frac{5}{24}y= \frac{7*4-3*3+5*2}{48} y= \frac{28-9+10}{48}y= \frac{29}{48}y$