Question

va rooog, dau coroană ​

Answer 1

Răspuns:

R

Explicație pas cu pas:

a) a=8√3 <B=<2C

90:3=30 <B=60° <C=30°

c=8√3/2=4√3 b=√64×3+16×3=4√15

b)b=12 3<B+2<C=225°

<B+<C=90°. <B=225-2×90=225-180=45°

<C=45°. B=45°

c=b=12. a =b/sinB=2×12/√2=12√2

c)a+b=2+√3, <C=30°. <B=60°

c=a/2 b= asinB=asin60°=a√3/2

a+a√3/2=2+√3

a=(2+√3)/(²1+√3/2)=2(2+√3)/2+√3)=2

b=a√3/2=2√3/2=√3

c=a/2=2/2=1

d)a-c=1 <B=60°. <C=30°

c=a/2. ²a-a/2=1 a/2=1. a=2

b=asinB=asin60=2√3/2=√3

c=asinC=asin30=2×1/2=1

e)a+c=3 a+b=2+√3

c=(3-a). b=2+√3-a

a²=b²+c². ( 2+√3)²=7+4√3

a²=(3-a)²+(2+√3-a)²=

a²=9-6a+a²+(7+4√3)-(4+2√3)a+a²

a²-a(10+2√3)+16+4√3=0

nu iese ceva ușor

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