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vă rog sa ma ajutati dau coroana

Vă Rog Sa Ma Ajutati Dau Coroana class=

Răspuns :

8.
3/9+4/9=7/9 ; 7/9-2/9 =5/9
9.
12/8-8/8=4/8= 1/2
12/10-7/10=5/10=1/2
7/6-4/6=3/6=1/2
10.
4/9+3/9+x=9/9;  9/9-7/9= 2/9
(3/7-2/7)+x= 7/7;  7/7-1/7=6/7
11.
1-3/4= 4/4-3/4=1/4
1-5/7= 7/7-5/7=2/7
1-2/5=5/5-2/5=3/5
2-4/6= 2*6/6-4/6= 12/6-4/6=8/6
2-5/6= 2*6/6-5/6=12/6-5/6=7/6
12.
1/2-1/4= 2/4-1/4=3/4
1/4-1/8=2/8-1/8=1/8
1/3-1/6= 2/6-1/6=1/6
1/5-1/10=2/10-1/10=1/10
1/2-3/8= 4/8-3/8=1/8