wykonaj podane działania :
a) ( 1 i 3/4 - 11/20 ) * ( 2 i 1/2 - 1i 7/18 )
b) ( 3 i 1/2 - 1 i 1/6) * ( 1 i 3/7 - 11/14 )
c) ( 3 i 2/5 - 3i 2/35 ) * ( 1 i 1/18 + 1/2 )
d) ( 1 i 1/3 - 1 i 2/9 ) * ( 1 i 4/5 + 9/10 )
e) ( 1 i 3/4 + 1/8 ) * (3 i 3/10 - 2 i 29/50 )
f) ( 1 i 1/2 + 2 i 1/10 ) * (2 i 1/2 - 1 i 3/7 )
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a) (7/4 - 11/20) * (5/2 - 7/18) = (35/20) * ( 45/18 - 7/18) = 24/20 * 38/18 <- Tu musisz skrócić 24 i 18 przez 6 oraz 38 i 20 przez 2<- = Wyjdzie 76/30 - 2 i 16/30 = 2 i 8/15
b) ( 7/2 - 7/6) * (10/7 - 11/14) = <Sprowadzic do wspolnego mianownika> (21/6 - 7/6) * (20/14 - 11/14) = 14/6 * 9/14 <Skracasz 14 z 14 przez 1 i 6 z 9 przez 3> = 3/2 = 1 i 1/2
c) (17/5 - 107/35) * ( 19/18 + 1/2) = (119/35 - 107/35) * (19/18 + 6/18) = 12/35 * 25/18 = 2/7 * 25/18 = 10/21
d) (4/3 - 11/9) * (9/5 + 9/10) = (12/9 - 11/9) * ( 18/10 + 9/10) = 1/9 * 27/10 = 1/1 * 3/10 = 3/10
e) (7/4 + 1/8) * (33/10 - 129/50) = (14/8 + 1/8) * (165/10 - 129/50) = 15/8 * 36/50 = 540/400 = 1 i 140/400 = 1 i 14/40 = 1 i 7/20
f) (3/2 + 21/10) * ( 5/2 - 10/7) = (15/10 + 21/10) * (35/14 - 20/14) = 36/10 * 15/14 = 18/2 * 3/7 = 54/14 = 27/7 = 3 i 6/7
Mam nadzieję, że pomogłam :)