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(5- x)la a2 = x-x+9b la a2
(x+3x)la a 2= x +12xy+x


Răspuns :

(5- x)² = x-x+9b²
(5- x)² = 9b ²

5-x=3b
x=5-3b


(x+3x)²= x +12xy+x

4x²=2x+12xy  I:2x
2x=1-6y
x=1-6y supra 2