uprość wyrażenie ;
(x-3)(x+3) +(2+x)(2-x)
Oblicz:
[tex](\sqrt{6}-\sqrt{5}) (\sqrt{6}+\sqrt{5})(\sqrt{6} -\sqrt{5} )do kwadratu
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1)
x^2 -3^2 + 2^2 -x^2= x^2-x^2 -9 +4 = -5
2)
= (√6) ² -(√5)² * ( 6 - 2√30 +5 ) =
= 6 - 5 * ( 11 -2√30) =
= 1 *( 11 -2√30) =
= 11 -2√30
1) x^2 -3^2 + 2^2 -x^2= x^2-x^2 -9 +4 = -5
2)= (√6) ² -(√5)² * ( 6 - 2√30 +5 ) = 6 - 5 * ( 11 -2√30) = 1 *( 11 -2√30) =11 -2√30
Liczę na naj:D