( 1/2 - 0,4-0,375)*2/5
————––——————=?
2/3*0,75

1/2 - 0,4-0,375=0.5 - 0,4-0,375= -0.275-0.275*2/5=-0.275*0.4=-0.112/3*0.75=2/3*3/4=2/4=0.5-0.11:0.5=-0.22