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La3
@La3
January 2020
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Calcule:
a)(7+√19).(7-√19)
b)(-3√5+1).(-3√5-1)
c)(2√7+3√5)²
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3478elc
a)(7+√19).(7-√19) = 49 - 19 ==> 30
b)(-3√5+1).(-3√5-1) = + 9.5 - 1 ==> 45 -1 ==> 44
c)(2√7+3√5)²=
(2√7)²+2.(2√7+3√5)+(2√7+3√5)² ==>(4.7)+ 2.(2√7).(3√5) + (9.5)
___
28 + 2.(2.3√7.5 ) + 45 ==> 73 + 12√35
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a)(7+√19).(7-√19) = 49 - 19 ==> 30
b)(-3√5+1).(-3√5-1) = + 9.5 - 1 ==> 45 -1 ==> 44
c)(2√7+3√5)²=(2√7)²+2.(2√7+3√5)+(2√7+3√5)² ==>(4.7)+ 2.(2√7).(3√5) + (9.5)
___
28 + 2.(2.3√7.5 ) + 45 ==> 73 + 12√35