(-6/5+3/4-2+9/20) ×(-5/2+1/10)+5/11×(-4/5+7/4+3/20)-5=
=(-6×4+3×5-2×20+9)/20 ×(-5×5+1)/10+5/11×(-4×4+7×5+3)/20-5=
=(-24+15-40+9)/20 ×(-25+1)/10+5/11×(-16+35+3)/20-5=
=(-40)/20 ×(-24)/10+5/11×22/20-5=
=(-2) ×(-12)/5+5/11×11/10-5=
=24/5+1/2-5=(48+5-50)/10=3/10
