Oblicz , pamiętając o kolejności wykonywania działań .
a) (3 1/2 + 1 1/2 )x 3 =
b) ( 2 2/3 - 4/5 ) x 1 3/7 =
c) ( 15 2/3 - 7 1/2 ) : 1 1/2 =
d) 2 x (1/3) do potęgi 2 + 3 x (1/2) do potęgi 3 =
e) 4 1/2 x 1 1/3 - 2 2/5 x 5/7 =
f) 1 2/3 - 5/6 + 2 1/10 : 1 6/15 =
g) (5/8 + 1/2 ) : 1 1/2 - 1/3 =
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a) (3 1/2 + 1 1/2 )x 3 = 5 x 3 = 15
b) ( 2 2/3 - 4/5 ) x 1 3/7 = (2 10/15 - 12/15) x 10/7 =
= (1 25/15 - 12/15) x 10/7 = 1 13/15 x 10/7 =
= 28/15 x 10/7 = 8/3 = 2 2/3
c) ( 15 2/3 - 7 1/2 ) : 1 1/2 = (15 4/6 - 7 3/6) : 3/2 =
= 8 1/6 x 2/3 =49/6 x 2/3 = 49/9 = 5 4/9
d) 2 x (1/3) do potęgi 2 + 3 x (1/2) do potęgi 3 =
= 2 x 1/9 + 3 x 1/8 = 2/9 + 3/8 =16/72 + 27/72 = 43/72
e) 4 1/2 x 1 1/3 - 2 2/5 x 5/7 = 9/2 x 4/3 - 12/5 x 5/7 =
= 6 - 12/7 = 6 - 1 5/7 = 5 7/7 - 1 5/7 = 4 2/7
f) 1 2/3 - 5/6 + 2 1/10 : 1 6/15 = 5/3 - 5/6 + 21/10 : 21/15 =
= 10/6 - 5/6 + 21/10 x 15/21 = 5/6 + 3/2 = 5/6 + 9/6 = 14/6 = 2 1/3
g) (5/8 + 1/2 ) : 1 1/2 - 1/3 =( 5/8 + 4/8) : 3/2 - 1/3 =
= 9/8 x 2/3 - 1/3 = 3/4 - 1/3 = 9/12 - 4/12 = 5/12