А) 2 1/14 - 1 2/3x = 1 5/21 б)(8/15 + 2/9y) : 3/5 = 2 г) 2/5m+ 3/10m - 2/15m = 1/6 д)z - 8/15z =1/3

а) 2 1/14 - 1 2/3x = 1 5/21 29/14-5/3x=26/21 -5/3x=26/21-29/14 26/21-29/14=52/42-87/42= -35/42 -5/3x= -35/42 X= 35/42:5/3 X=35/42×3/5 X=7/14=1/2 б)(8/15 + 2/9y) : 3/5 = 2 (8/15 + 2/9y)=2×3/5 8/15 + 2/9y=6/5 2/9y=6/5-8/15 2/9y=18/15-8/15 2/9y=10/15 2/9y=2/3 Y=2/3:2/9 Y=2/3×9/2 Y=3 г) 2/5m+ 3/10m - 2/15m = 1/6 2/5+3/10=4/10+3/10=7/10 7/10-2/15=21/30-4/30=17/30 17/30m=1/6 m=1/6:17/30 m=1/6×30/17 m=5/17 д)z - 8/15z =1/3 7/15z=1/3 z=1/3:7/15 z=1/3×15/7 z=5/7