zadania w zalączniku tylko 17, 18 ,19 zadanie!!
zad.17
a)
a+2 3/5=7
a=7-2 3/5
a=4 2/5
b)
3 1/2+b=5 1/5
3 5/10+b=5 2/10
b=5 2/10-3 5/10
b=1 7/10
c)
d-2 2/3=1 1/2
d=13/6+2 4/6
d=3 7/6
d=4 1/6
d)
4 1/8-c=2 5/6
c=4 3/24-2 20/4
c=1 7/24
zad.18
a=14 3/4dm
b=4dm
ob.=2a+2b
ob=2*14 3/4+2*4
ob=59/2+8
ob=29 1/2+8=37 1/2
zad.19
a=6 3/4m
b=6 3/4m-1 2/5m=6 15/20m-1 8/20m=5 7/20m
c=5 7/20m-1 1/2m=5 7/20m-1 10/20m=3 17/20m
ob=a+b+c
ob=6 3/4m+5 7/20m+3 17/20m=6 15/20m+5 7/20m+3 17/20=14 39/20m=15 19/20m
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zad.17
a)
a+2 3/5=7
a=7-2 3/5
a=4 2/5
b)
3 1/2+b=5 1/5
3 5/10+b=5 2/10
b=5 2/10-3 5/10
b=1 7/10
c)
d-2 2/3=1 1/2
d=13/6+2 4/6
d=3 7/6
d=4 1/6
d)
4 1/8-c=2 5/6
c=4 3/24-2 20/4
c=1 7/24
zad.18
a=14 3/4dm
b=4dm
ob.=2a+2b
ob=2*14 3/4+2*4
ob=59/2+8
ob=29 1/2+8=37 1/2
zad.19
a=6 3/4m
b=6 3/4m-1 2/5m=6 15/20m-1 8/20m=5 7/20m
c=5 7/20m-1 1/2m=5 7/20m-1 10/20m=3 17/20m
ob=a+b+c
ob=6 3/4m+5 7/20m+3 17/20m=6 15/20m+5 7/20m+3 17/20=14 39/20m=15 19/20m