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2 7/12 - 1 11/12= 1 19/12-1 11/12=8/12=2/3
zadanie 6
a)3/4 - 1/7= 21/28-4/28=17/28
7/10-4/15=21/30-8/30=13/30
3/14-1/5=15/70-14/70=1/70
b) 2 3/5-7/10=2 6/10 - 7/10=1 16/10-7/10=1 9/10
2 3/8-1 5/6= 2 9/24-1 20/24=1 33/24-1 20/24=13/24
3 1/6-2 3/4= 3 2/12-2 9/12=2 14/12-2 9/12= 5/12
zadanie 8
c) 0,75+1/2=0,75+0,5=1,25
d) 1,75-1/2= 1,75-0,5= 1,25
e) 0,5+2/5=0,5+0,4=0,9
f) 0,8-2/5=0,8-0,4=0,4
g) 1/4+0,6=0,25+0,6=0,85
h) 1,6-1/2=1,6-0,5=1,1
i) 1,5+4/5=1,5+0,8=2,3
j)1 3/4-0,25=1,75-0,25=,15