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Dovediti ca A = 2\/3-5
A =(\/3-2) la a 2 a -(\/3-3)la a 2 a
B = 9 -2\/3


Răspuns :

(√3-2)²-(√3-3)²=
3-4√3+4-(3-6√3+9)
7-4√3-(12-6√3)=
7-4√3-12+6√3=
2√3-5
revin  imediat
Ma=(A+B)/2=
(2√3-5+9-2√3)/2=4/2=2