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(1/2-b)^2
Ajutati-ma va rog ..


Răspuns :

[tex]( \frac{1}{2}-b) ^{2} =( \frac{1}{2} ) ^{2} -2* \frac{1}{2} *b+b ^{2}= \frac{1}{4} -1+ b^{2} =- \frac{3}{4} + b^{2} [/tex]