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Thewolf27
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Va rog dau coroana repede !!!

Va Rog Dau Coroana Repede class=

Răspuns :

Ancutaiordan
1) x^2-2 
X^2=2
|x|=2
2) 7y^2-5a^2
7y^2=5a^2
y^2=5a^2 /7
3) 7a^2-11y^2
11y^2=7a^2
y^2=7a^2 /11

5) (7-x)^2 - (3x-1)^2 = (7-x-3x+1)(7-x+3x-1) = (8-4x)(6+2x)=48+16x-24x-8x^2=       = -8x^2-8x+48 = -x^2-x+6
a^2-b^2=(a-b)(a+b)
a=7-x
b=3x-1


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