Zad. 3
[tex]\frac49=0.(4)=0.4\\\frac7{25}=\frac{28}{100}=0.28=0.3\\0.4+0.3=0.7[/tex]
Odp. B
4.
[tex]1cm - 1 000 000cm\\\\5cm = 5*1 000 000cm = 5 000 000cm = 50km[/tex]
Odp. A
[tex]1cm = 1 000 000cm\\x = 3 000 000cm\\\frac{3 000 000}{1 000 000}=3cm[/tex]
Odp. C
5.
a)
2 tygodnie = 2*7 dni = 14 dni
Kwiecien ma 30 dni
[tex]\frac{14}{30}=\frac7{15}[/tex]
Prawda
b)
[tex]1kg = 100dag\\1 dag = 10g\\1kg = 1000g\\0.14kg = 140g[/tex]
Falsz
c)
[tex]1dm = 10cm\\1m = 100cm\\\\3dm 5cm = 30cm + 5cm = 35cm = 0,35m[/tex]
Falsz
[tex]1t = 1000kg\\1kg = 0.001t\\\frac15*0,001t = \frac15*\frac1{1000}t=\frac1{5000}t=\frac{2}{10000}t=0.0002t[/tex]
Prawda
