(0.4-3/20)*6 2/3 - 1.75 / (-7 7/8 ) =?
СРОЧНО ПЖ РЕБЯТ )))

=(4/10-3/20)*20/3 - 175/100/ : (-63/8)=(8/20-3/20)*20/3 + 7/4*8/63= 5/20*20/3+7/4*8/63= 5/3+2/9=15/9+2/9=17/9=1ц8/9