1.Rozwiąż układ równań
0,3x + 0,4y = 27
2. Oblicz
Rozwiązanie:
zad.1
x+y = 80 / *(-3)
3x+4y=270
-3x-3y=-240
3x+4y = 270
y=30
x+30 = 80
x=80 - 30
x=50
zad.2
3600 *15*15/ 2400= 3600*240/2400= 864000/2400 = 360
1
x+y=80
0,3x+0,4y=27/*10
x+y=80/y
x=80-y
3*(80-y)+4y=270
210-3y+4y=270/-210
y=60
x=80-60
x=20
2,
3600*16(14+1)/2400= 3600*16*15/2400=57600*15/2400=864000/2400=360
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Rozwiązanie:
zad.1
x+y = 80 / *(-3)
3x+4y=270
-3x-3y=-240
3x+4y = 270
y=30
x+30 = 80
x=80 - 30
x=50
x=50
y=30
zad.2
3600 *15*15/ 2400= 3600*240/2400= 864000/2400 = 360
1
x+y=80
0,3x+0,4y=27/*10
x+y=80/y
3x+4y=270
x=80-y
3*(80-y)+4y=270
x=80-y
210-3y+4y=270/-210
x=80-y
y=60
x=80-60
y=60
x=20
y=60
2,
3600*16(14+1)/2400= 3600*16*15/2400=57600*15/2400=864000/2400=360