Question

10x-8y при x=3/5, y=5/8

Answer 1

(10*3)/5 - (8*5)/8
После сокращения: (2*3) - 5 = 6-5=1

Answer 2

$10x-8y=10*frac{3}{5}-8*frac58=2*3-5=6-5=1$