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(3pe2)a a doua-(3pe 8-2pe 5)+(7pe4-1pe2)=

Răspuns :

(3/2)² -(3/8 -2/5) +(7/4 -1/2)= 9/4 -3/8 +2/5+7/4 -1/2= (90-15+16+70-20) / 40=

= 141 /40