Предмет: Алгебра, автор: darkcrusade99

Помогите решить, пожалуйста! срочно нужно!

Приложения:

sedinalana: какие 3?
darkcrusade99: 1,2,3
darkcrusade99: хотя нет, ошибочка. 4,5,6, будьте так добры)
sedinalana: поздно пить боржоми

Ответы

Автор ответа: sedinalana
1
1
x=2
(3*2-1)/(y+3)=1⇒5/(y+3)=1⇒y+3=5⇒y=2
y=2
(3x-1)/5=4⇒3x-1=20⇒3x=21⇒x=7
ответ 3
2
S=1/2*a*b,S=96
a/b=3/4⇒a=3b/4
1/2*3b/4 *b=96
b²=96:3/8=96*8/3=32*8=256
b=16
a=3/4*16=12
c=√a²+b²=√144+256=√400=20
Ответ 4
3
t1=S/6
t2=S/4
v=2s:(s/6+s/4)=2S:(2S/12+3S/12)=2S:5S/12=2S*12/5S=24/5=4,8км/ч
Ответ 3

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