Question

Subiectul 1 va rog urgent ​

Answer 1

Răspuns:

1)

(2x-3)/5-(x+1)/2<=(x-3)/10

[2*(2x-3)-5*(x+1)]/10<=(x-3)/10 | *10

4x-6-5x-5<=x-3

-x-11<=x-3

x+x>=+3-11

2x>=-8

x>=-4

S=(-4;+infinit)

2)

x^2-y^2=297=>(x-y)(x+y)=297 (1)

x-y=11 (2)

Din (1) si (2) => 11*(x+y)=297=>x+y=297/11=>x+y=27

3)

P(-8;-6) O(0,0)

d(P,O)=radical[(xp-xo)^2+(yp-yo)^2]=radical[(-8-0)^2+(-6-0)^2]=radical(64+36)=radical(100)=10

4)

A=[(AB^2-CD^2)*tg(ABC)}/4=>80=[(28-12)*(28+12)*tg(ABC)]/4

80=(16*40*tg(ABC)]/4=>80=160*tg(ABC)

tg(ABC)=80/160=1/2

5)P=6*a=> 36=6*a=> a=36/6=6

R=a=6

A=pi*R^2=36pi

Explicație pas cu pas: