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ex.: 9!!! ajutor!!!!!

Ex 9 Ajutor class=

Răspuns :

a) 4/5+3/2 × 2/9=4/5+1/3=(12+5)/15=17/15
b) (2,5-0,25-2)×10+1/2=0,25×10+1/2=2,5+0,5=3
c)[5,(4)]¹⁸ :(49/9)¹⁷=(49/9)¹⁸:(49/9)¹⁷=49/9
5,(4)=(54-5)/9=49/9
la d nu se vad semnele bine
e)(65/195+108/324+122/366) ×(24/168-6/42)=
=(1/3+1/3+1/3)×(1/7-1/7)=1×0=0