Odpowiedzi

2010-02-05T19:04:00+01:00
1.
a). 8-1/27x³=0 /*27
216 - 1x³=0
216= x³
x=36
b). 8x³-1=0
8x³=1 /:8
x³=1/8
x= 1/2
c).27- 64y³= 0
27= 64y³ /64
y³= 27/64
y= 3/4

2010-02-05T19:23:21+01:00
1. a) 8-1/27x³=0
8=1/27x³ /*27x³
216x³=1
x³=1/216
x=1/6
b) 8x³-1=0
8x³=1
x³=1/8
x=1/2
c)27-64y³=0
27=64y³
27/64=y³
y=3/4
2.a)x³-9x=0
x³=9x
x²=9
x=3
b)x³-4x=0
x³=4x
x²=4
x=2
c)2x³+x²=0
2x³=-x²
2x=-1
x=-2
d)- -2x³-2x=0
2x³-2x=0
2x³=2x
x³=x
x²=1
x=1


2010-02-05T20:28:14+01:00
Zad 1
a) x=2
8 - 1/27 * x3 = 0
8 - x3 = 0
8 - x3 = 0
-x3 = 8
x3 = -8
x = 2

b) x=0,5
8 * x3 - 1 = 0
8 *x3 = 1 //8
x3 = 1/8
x = 1/2

c) y=0,75
27 - 64y3 = 0 /(-27)
-64y3 = -27 //(-64)
y3 = - 27/64
y = - 3/4