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3*(3intregi 1/2-1,25*2)-(radical din 5-2,5/ radical din 5)*radical din 5.

Răspuns :

3*(3int1/2-1,25*2)-(√5-2,5/√5)*√5=
3*(7/2-2,5)-(√5-2,5√5/5)*√5=
3*(3,5-2,5)-(5√5/5-2,5√5/5)*√5=
3*1--2,5√5/5*√5=
3-12,5/5=3-2,5=0,5