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Răspuns :

7+8+9+10=34 . ex9 
1800. 1200/2=600 . 600*3=1800. ex10

ex2
14,8:2-(1,5+59:10)+0,25×1,6=
7,4-(1,5+5,9)+0,4
7,4-7,4+0,4=0,4