Question

1.Oblicz wartosc wyrazen dla x=3.

a) 2x+5

b)2(x+5)

c)x(2+5)

2.Oblicz wartosc wyrazenia 5x^2-y ---^ to znaczy do potęgi 2

a) x=3 y=2

b) x=5 y=-3

c)x=0,5 y+ 1/3

d) a=1 b =1

e) a= -2 b = 2

f) a= 2 b=-2

Answer 1

1. x = 3

a) 2 * 3 + 5 = 6 + 5 = 11

b) 2 * (3 + 5) = 2 * 8 = 16

c) 3 * (2 + 5) = 3 * 7 = 21

 

2. 5x^2 - y

a) 5 * 3^2 - 2 = 5 * 9 - 2 = 45 - 2 = 43

b) 5 * 5^2 - (-3) = 5 * 25 + 3 = 125 + 3 = 128

c) 5 * (0,5)^2 - 1/3 = 5 * 0,25 - 1/3 = 1,25 - 1/3 = 1 i 1/4 - 1/3 = 5/4 - 1/3 = 15/12 - 4/12 = 11/12

d) 5 * 1^2 - 1 = 5 - 1 = 4

e) 5 * (-2)^2 - 2 = 5 * 4 - 2 = 20 - 2 = 18

f) 5 * 2^2 - (-2) = 5 * 4 + 2 = 20 + 2 = 22