Odpowiedź:
zad 1
a)
1 1/3 + 3 3/4 = 1 4/12 + 3 9/12 = 4 13/12 = 5 1/12
b)
- 3 2/7 + 7 6/7 = 4 4/7
c)
3/4 * (- 2/7) = - ( 3/4 * 2/7) = - ( 3/2 * 1/7) = - 3/14
d)
2 1/5 : (- 1/10) = - ( 11/5 * 10) = - 11 *2 = - 22
zad 2
a)
3⁷ * 3⁻⁷ = 3⁷⁻⁷= 3⁰= 1
b)
√16 + √0,36 = 4 + 0,6 = 4,6
zad 3
a)
100000 = 10⁵
b)
0,001 = 10⁻³
c)
1000 = 10³
zad 4
a)
3x + 4 = 31
3x =31 - 4 =27
x = 27/3 = 9
b)
4x - 3 = 2x - 9
4x - 2x = - 9 + 3
2x = - 6
x = - 6/2 = - 3
