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Iuliamaria6
a fost răspuns

dau coroana pls!!!urgent

Dau Coroana Plsurgent class=

Răspuns :

x-y=3
x²-y²=(x-y)(x+y)=3(x+y)=12
x+y=12/3=4

a=4+4²+4³=4+16+64=84
Dutasabina
x-y=3 => x=3+y ;
x^2-y^2=12 => (x+y)(x-y)=12 => (x+y)=12/(x-y) => x+y=12/3 =>
=> x+y=4
=>3+y+y=4=> 3+2y=4 => 2y=4-3 => 2y=1 => y=0,5;
a=(x+y)[1+x+y+(x+y)^2] ;
a=4(1+3+y+y+4^2) ;
a=4(4+2*0,5+16) ;
a=4(4+1+16) ;
a=4*21 ;
a=84

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