Question

repede,am nevoie urgent!​

Answer 1

Răspuns:

A) DOB opus la vf cu AOC => AOC=DOB => AOC=40

Dar AOD suplementar cu AOC => AOD = 180-40

AOD=140

AOD si COB sunt opuse la vf => COB = AOD =>COB = 140

AOC=40 AOC=40 COB=140 DOB=140

B) AOC +AOB = 180

Dar AOC=x/2 iar AOB=90+x

=> x/2 +90+x =180

=>x/2+x=90

Amplifica x cu 2 => x/2+2x/2 =90 => 3x/2 =90

3x =90 x 2 => 3x=180 => x=60

AOD= 60 +90 =150 iar AOD opus la vf cu COB => COB =150

AOC=60/2 =30

AOC si DOB opuse la vf => AOC =DOB => DOB= 30

C) AOC +AOD =180

= 3x + 5x+20=180 => 8x = 160 => x=20

AOC = 20 x 3 = 60 iar AOC opus la vf cu DOB

=> DOB=60

AOD =20x5+20 = 100+20 = 120

Iar AOD opus la vf cu COB => COB=AOD =>COB=120

D) COD+DOB=180

x/5+7x/3-10=180 => x/5 + 7x/3 = 190

Amplificam x/5 cu 3 si 7x/3 cu 5

=> 3x/15 +35x/15 =190

=> 38x/15 =190 => x= 190x15:38 =75

DOB = 75/5= 15 iar DOB opus la vf cu AOC => AOC= 15

COB= 75x7/3 = 175

COB opus la vf cu AOD => AOD=175

sper ca te-am ajutat