Odpowiedź:
12.a) 0,48 kg b) 1,49 zł c) 0,49 g d) 0,035 t
13. 4,2 tys( 3,5 :5 = 0,7 3,5+0,7=4,2)
14. b)
[tex] \frac{70}{1} = 70[/tex]
15.
8,3-2=6,3
6,3:0,7=9
Odp. Do kanistra nalano 9 litrów paliwa.
16. a)
[tex]2.5 + 2 \times \frac{1}{2} = 2.5 + 1 = 3.5[/tex]
[tex]5.5 \div 5 + \frac{3}{4} = 1 \frac{1}{10} + \frac{3}{4} = 1 \frac{2}{20} + \frac{15}{20} = 1 \frac{17}{20} [/tex]
b)
[tex] \frac{4}{5} \div (5 \times 0.2) = \frac{4}{5} \div 1 = \frac{4}{5} [/tex]
[tex](0.2 + \frac{4}{5} ) \times 3 = ( \frac{2}{10} + \frac{8}{10} ) \times 3 = 1 \times 3 = 3[/tex]
