Question

Oblicz . Zapisz wyniki w jak najprostrzej postaci
a) 1 1\4 x 7\10 =
2 2\5 x 3 1\3 =
3\4 : 2 =
5\7 : 2\3 =
1 7\10 : 2\5 =
2 1\4 : 1 3\5 =
1 1\2 + 5\6 =
3 3\4 + 1 2\7 =
2 9\10 - 3\4 =
4 2\3 - 1 2\5

Answer 1

Moj przedmówca napisał obliczenia tylko chodzi  wynik 
wynosi  3 całe i 4/15

Answer 2

A)
1 i 1/4 * 7/10 = 

= 5/4 * 7/10 = (skracam 5 z 10)

= 1/4 * 7/2=

= 7/8



2 i 2/5 * 3 i 1/3 = 

= 12/5 * 10/3=  (skracam 12 z 3 oraz 5 z 10)

= 4/1 * 2/1=

= 8/1=

= 8



3/4 : 2 = 

= 3/4 * 1/2 =

= 3/8




5/7 : 2/3 =

= 5/7 * 3/2 =

= 15/14=

= 1 i 1/14



1 i 7/10 : 2/5 =

= 17/10 * 5/2 =  (skracam 10 z 5)

= 17/2 * 1/2=

= 17/4=

= 4 i 1/4



2 i 1/4 : 1 i 3/5 =

= 9/4 : 8/5=

= 9/5 * 5/8 =  ( skracam 5 z 5)

= 9/1 * 1/8=

= 9/8=

= 1 i 1/8




1 i 1/2 + 5/6 = 

= 1 i 3/6 + 5/6=

= 1 i 8/6=

= 2 i 2/6=

= 2 i 1/3




3 i 3/4 + 1 i 2/7 = 

= 3 i 21/28 + 1 i 8/28=

= 4 i 29/28=

= 5 i 1/28




2 i 9/10 - 3/4 = 

= 2 i 18/20 - 15/20 =

= 2 i 3/20




4 i 2/3 - 1 i 2/5=

= 4 i 10/15 - 1 i 6/15=

= 3 i 4/15