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Efectuați:
a)(7,3-2,8):5;
c)6,2+4-(18,53-4-3,24);
e)2-(15,6-7,8-1,2);
b )407,2+11-(57,6-2-84,9:4);
d )64,8:8+3-(12,206:2-3,54);
f )5-(189,7-23,6-4,5)+2-(506:11-23,4).