Zadanie 1
a) [tex]\frac{42+21}{62-53} = \frac{63}{9} =7[/tex]
b) [tex]\frac{7,4+1,44}{0,5*8} = \frac{8,84}{4} =2,21[/tex]
c) [tex]2\frac{1}{10} + \frac{3}{5}=2\frac{1}{10}+\frac{6}{10}=2\frac{7}{10}[/tex]
[tex]2\frac{8}{18} - 1\frac{1}{6} = 2\frac{8}{18}-1\frac{3}{18}=1\frac{5}{18}[/tex]
d) [tex]1\frac{4}{5}*\frac{5}{9}=\frac{9}{5} *\frac{5}{9}=1[/tex]
[tex]\frac{6}{7}:\frac{3}{14}=\frac{6}{7}*\frac{14}{3}=4[/tex]
Zadanie 2
A / D
Zadanie 3
B
Zadanie 4
[tex]\frac{30}{20}=\frac{x}{120}[/tex]
[tex]20x=3600|:20[/tex]
[tex]x=180[/tex]
Odp. C
Zadanie 5
1. F
2. P
Zadanie 6
B
Zadanie 7
498 g = 0,498 kg
70 dag =0,7 kg
2,3 kg + 0,498 kg + 0,7 kg = 3,498 kg
Odp. W sumie przedmioty ważą 3,498 kilogramów.
Zadanie 8
1. P
2. P
3. F
4. P
Zadanie 9
[tex]6\frac{1}{5}-1\frac{1}{6}*4,8=49,8[/tex]