Odpowiedź:
1. D
2. D
3. A
4. -2 1/2
5. -3
6. C
7.
[tex] \frac{ - 11 + 5 \times ( - 11)}{3} - ( - 6) = \frac{ - 11 - 55}{3} + 6 = \frac{ - 66}{ 3} + 6 = - 22 + 6 = - 16[/tex]
8. (-7,7)
9.
[tex] \frac{1 + 2 + ( - 1.5) + ( - 1) + ( - 3.5) + ( - 4) + 0}{7} = \frac{ - 7}{7} = - 1[/tex]
odp. Średnia temperatura powietrza wynosi (-1)°.
10.
[tex] \frac{x}{21} \div ( - \frac{3}{7} ) = - 7 \\ \frac{x}{21} \times ( - \frac{7}{3} ) - 7 \\ \frac{x}{3} \times ( - \frac{1}{ 3 } ) = - 7 \\ \\ ( - \frac{x}{9} ) = - 7 \\ x = 63 \\ (- \frac{63}{9} ) = - 7[/tex]
