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(2x radical3-3radical2)×(2x radical 3+3radical2)=?
Regula de calcul este a*2-b*2


Răspuns :

(2√3-3√2)(2√3+3√2)=
(2
√3)^2 - (3√2)^2=
2^2*3 - 3^2*2= -6

(2x√3-3√2)(2x√3+3√2)=0
(2x
√3)^2 - (3√2)^2=0
12x^2-18=0
12x^2=18 => x^2=18/12 => x^2=3/2 => x=
√3/2; x= -3/2
(2√3x-3√2)(2√3x+3√2)=
=(2√3x)²-(3√2)²=
=(2²·√3²·x²)-(3²·√2²)=
=4·3x²-9·2=
=12x²-18
sper ca te-am ajutat :)