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2. odp. C
3. odp. A
4. (4 1/2 - 2/5 + 1,6) : 3/4 * 4 = (9/2-2/5+8/5)*4/3*4 = (45/10-4/10+16/10)*4/3*4 = 49/10*4/3*4 = 49/5 * 8/3 = 392/15 = 26 2/15
5.
(1/2)^-2 = 4 ; 2^-3 = 1/8 ; (-1/3)^-2 = 9 ; (0,1)^3 = 0,001
6. odp. B
7. odp. A
8.
A. 1,8 * 10^-4 km = 18 mm
B. 1,8 * 10^-3 m = 18 mm
C. 1,8 * 10^-1 dm = 18 mm
D. 1,8 * 10^3 cm = 18 m