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kobzarenko99
@kobzarenko99
July 2022
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Сделать срочно 2-4 даю 20 балов
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oganesbagoyan
Verified answer
2)
S(ABCD) =2*S(ABC) =2*(AC*BN)/2 =AC*BN .
Из прямоугольного ΔABC :
BN² =AN*NC =AN*(NK+KC) =AN*(AN+KC
) =x(x +9). ||AN =x||.
* * *
ΔANB =ΔCKD ⇒
AN =KC * * *
6
² =x(x+9)⇔x² +9x -36 =0 ⇒ [x = -12(не решения задачи); x=3.
S(ABCD) =AC*BN =(3+9+3)*6 =90
.
-------
3)
6 м = 60 дм ; 6,3 м =63
дм. * * * (60:3 =20 ; 63: 3 =21) * * *
3*3*n =60*63⇒n = 60*7 = 420.
-------
4)
S(ABCD) =(AB+DC)/2 *h =(2+5)/2 *5 =(7*5)/2 =35/2 =17,5.
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Answers & Comments
Verified answer
2)S(ABCD) =2*S(ABC) =2*(AC*BN)/2 =AC*BN .
Из прямоугольного ΔABC :
BN² =AN*NC =AN*(NK+KC) =AN*(AN+KC) =x(x +9). ||AN =x||.
* * * ΔANB =ΔCKD ⇒ AN =KC * * *
6² =x(x+9)⇔x² +9x -36 =0 ⇒ [x = -12(не решения задачи); x=3.
S(ABCD) =AC*BN =(3+9+3)*6 =90.
-------
3)
6 м = 60 дм ; 6,3 м =63 дм. * * * (60:3 =20 ; 63: 3 =21) * * *
3*3*n =60*63⇒n = 60*7 = 420.
-------
4)
S(ABCD) =(AB+DC)/2 *h =(2+5)/2 *5 =(7*5)/2 =35/2 =17,5.