2/3 + 1/5 =
2/5 - 1/2 =
4/5 : ( 1/2 - 1/5 ) =
2/3 + 1/5 = 10\15 + 3\15 = 13\15
2/5 - 1/2 = 4/10 - 5/10 = -1/10
4/5 : (1/2 - 1/5) = 4/5 : (5/10 - 2/10) = 4/5 : 3/10 = 4/5 x 10/3 = 8/3 = 2 2/3 [dwa i dwie trzecie]
2/3 + 1/5 = 10/15 + 3/15 = 13/15
bo
2/3 = ( 2*5(/( 3*5) = 10/15 <-- 2/3 rozszerzamy przez 5
1/5 = ( 1*3)/( 5*3) = 3/15 <--- 1/5 rozszerzamy przez 3
----------------------
2/5 - 1/2 = 4/10 - 5/10 = - 1/10
---------------------------------------
4/5 - ( 1/2 - 1/5) = 8/10 - ( 5/10 - 2/ 10) = 8/10 - 3/10 = 5/10 = 1/2
==============================================================
4/5 : ( 1/2 - 1/5) = 4/5 : ( 5/10 - 2/10) = 4/5 : 3/10 = 4/5 * 10/3 = 40/15 =
= 2 10/15 = 2 2/3
===================
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2/3 + 1/5 = 10\15 + 3\15 = 13\15
2/5 - 1/2 = 4/10 - 5/10 = -1/10
4/5 : (1/2 - 1/5) = 4/5 : (5/10 - 2/10) = 4/5 : 3/10 = 4/5 x 10/3 = 8/3 = 2 2/3 [dwa i dwie trzecie]
2/3 + 1/5 = 10/15 + 3/15 = 13/15
bo
2/3 = ( 2*5(/( 3*5) = 10/15 <-- 2/3 rozszerzamy przez 5
1/5 = ( 1*3)/( 5*3) = 3/15 <--- 1/5 rozszerzamy przez 3
----------------------
2/5 - 1/2 = 4/10 - 5/10 = - 1/10
---------------------------------------
4/5 - ( 1/2 - 1/5) = 8/10 - ( 5/10 - 2/ 10) = 8/10 - 3/10 = 5/10 = 1/2
==============================================================
4/5 : ( 1/2 - 1/5) = 4/5 : ( 5/10 - 2/10) = 4/5 : 3/10 = 4/5 * 10/3 = 40/15 =
= 2 10/15 = 2 2/3
===================