Jest to sprawdź sam siebie strona 157 MATEMATYKA
Polecenie : Oblicz
a) 5/12 : 10 =
b) 2 i 4/5 * 3 =
c) 3 i 4/7 : 3 =
d) ( 16 i 3/8 - 5 i 3/5 ) :5 =
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a)5/12:10=5/12*1/10(skróć 5 i 10 przez 5)=1/24
b)2 i 4/5*3=14/5*3/1=42/5=8 i 2/5
c)3 i 4/7:3=25/7*1/3=25/21=1 i 4/21
d)(16 i 3/8-5 i 3/5):5=(131/8-28/5):5=(655/40-224/40):5=431/40:5=431/40*1/5=
=431/200=2 i 31/200