Odpowiedzi

2010-03-23T20:02:41+01:00
Zadanie 1
7x+y=5/ * (-2)
5x+2y=1
-14x-2y=-10
5x+2y=1
-9x=-9/ : (-9)
x=1
5*1+2y=1
x=1
2y=1-5
x=1
2y=-4/ :2
x=1
y=-2



Tamtych nie potrafie :(
2010-03-23T20:15:04+01:00
Zad. 1
7x+y=5 => y=5-7x
5x+2(5-7x)=1
5x+10-14x=1
-9x=-9
x=1
y=5-7*1= -2

zad.2
d-dł, łuku = 3 π
α=30
r=?

α/360 = d/ (2πr)
r= 360°d/ (2πα)
r = 360 * 3π / 2π*30 = 18 j


zad.3
x- il solanki 2%
y - il solanki 5 %

x+y=12 => y=12-x

2/100 x + 5/100 y = 3/100 * 12
2x + 5(12-x) = 36
2x+60-5x=36
-3x=-24
x=8
y=4
1 4 1