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Calculati:
a) (-6V2)²-(5V3)²
b) (-3V5)²+(2V2)²
c) (5V3)²-(-2V7)²
Va rog repede dau coroana


Răspuns :

a) ( - 6√2 )² - ( 5√3 )² =

= 36 x 2 - ( 5√3 )² =

= 36 x 2 - 25 x 3 =

= 72 - 25 x 3 =

= 72 - 75 =

= - 3

b) ( - 3√5)² + ( 2√2)² =

= 9 x 5 + ( 2√2 )² =

= 9 x 5 + 4 x 2 =

= 45 + 4 x 2 =

= 45 + 8 =

= 53

c) ( 5√3 )² - ( 2√7 )² =

= 25 x 3 - ( 2√7 )² =

= 25 x 3 - 4 x 7 =

= 75 - 4 x 7 =

= 75 - 28 =

= 47