РЕШИ №1
а) 1,5+(-y)= -3.2; -у=-3,2-1,5; у=4,7;///
б) -а:0,8=1,25; -a=1,25*0,8; a=-1; ///
в) -3/5b=1/15; b=1/15:(-3/5); b=1/15*(-3/5); b=-1/25;///
№2
-2ц5/8:1ц3/4+(-8,7-(-2,3)):0,8-2ц2/9*(-0,6);
-21/8*4/7+(-8,7+2,3):8/10+20/9*6/10;
-3/2-64/10*10/8+4/3;
-3/2-8+4/3=-8 3/2+4/3=-8 9/6+8/6=-8 1/6