И) 2/5z+2/3z-1/5=2 1/2

к) 3 1/2 * (2/3 х+4/7) = 2 1/2

л) (5/8 х-1/5) * 3/4=3/4

м) 3/5z+2/3z-3=4/5

и) 2/5z+2/3z-1/5=2 1/2

6/15z+10/15z=25/10+2/10

16/15z=27/10

z=27/10*15/16

z=81/32=2 17/32

к) 3 1/2 * (2/3 х+4/7) = 2 1/2

2/3 х+4/7=5/2*2/7

2/3 х=5/7-4/7

2/3 х=1/7

х=1/7*3/2

х=3/14

л) (5/8 х-1/5) * 3/4=3/4

5/8 х-1/5=3/4*4/3

5/8 х=1+1/5

5/8 х=5/5+1/5

5/8 х=6/5

х=6/5*8/5

х=48/25

м) 3/5z+2/3z-3=4/5

9/15z+10/15z=4/5+15/5

19/15z=19/5

z=19/5*15/19

z=3