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ппопцгуарг
ппопцгуарг
06.09.2020 07:44 •  Алгебра

с решением буду благодарна!​
случайно закинула в тему алгебры, но это геометрия, извиняйте х)

👇
Ответ:
elena0795
elena0795
06.09.2020

<ВАС=30°

<АВС=120°

<ВСА=30°

Объяснение:

треугольник ADB:

<D=90°

25,2:12,8=2, гипотенуза в 2 раза больше катета

=> <ВАС=30°. тк треугольник АВС равнобедренный, то <ВСА=30°

180°-2×30°=120°

<АВС=120°

4,5(99 оценок)
Ответ:
lilav
lilav
06.09.2020

∠BAC=30°   ∠BCA=30°  ∠ABC=120°

Объяснение:

т.к. BD⊥AC то Δ ADB -прямоугольный BD=AB/2 ⇒ ∠BAC=30°

(в прямоугольном треугольнике катет, лежащий против угла в 30° равен половине гипотенузы)

Δ АВС-равнобедренный ∠ВАС=∠ВСА ⇒ ∠ВСА=30°

∠АВС=180°-2∠ВАС  ∠АВС=180°-2·30°=120°

4,5(37 оценок)
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Ответ:
катя4842
катя4842
06.09.2020
1)2cos²x+5sinx-4=0
2-2siin²x+5sinx-4=0
2sin²x-5sinx+2=0
sinx=a
2a²-5a+2=0
D=25-16=9
a1=(5-3)/4=1/2⇒sinx=1/2⇒x=(-1)^n *π/6+πn
a2=(5+3)/4=2⇒sinx=2∈[-1;1]
x=π/6 наим
2tgπ/6-1=2*√3/3 -1=(2√3-3)/3
2)cos(x+π/6)≤-1/2
2π/3+2πn≤x+π/6≤4π/3+2πn
2π/3-π/6+2πn≤x≤4π/3-π/6+2πn
π/2+2πn≤x≤7π/6+2πn
x∈[π/2+2πn;7π/6+2πn]
3)2sin^2x+3sinxcosx+cos^2 x=0 /cos²x≠0
2tg²x+3tgx+1=0
tgx=a
2a²+3a+1=0
D=9-8=1
a1=(-3-1)/4=-1⇒tgx=1⇒x=π/4
a2=(-3+1)/4=-1/2⇒tgx=-1/2⇒x=-arctg0,5+πn
4)y=√(2x+6 -x  [-3;∞)
y`=2/2√(2x+6  -1=1/√(2x+6) -1=(1-√(2x+6)/√(2x+6)=0
√(2x+6)=1
2x+6=1
2x=-5
x=2,5∈ [-3;∞)
y(2,5)=√11 -2,5≈0,8-наим
y(0)=√6≈2,4наиб
4,7(29 оценок)
Ответ:
гсооагвгв
гсооагвгв
06.09.2020

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4,8(58 оценок)
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