Question

Zad.1
Oblicz.
a) 1/4 x (-1/5)
b) (-3/5) x (-5/11)
c) (-4/9) x 3/14
d) (-2/5) : 5/8
e) 8/9 : (-10/21)
f) (-5/12) : (-25/36)

Zad.2

Oblicz.
a) 1 1/3 x (-3/8)
b) (-2 4/5) x (-1 3/7)
c) (-4 1/2) x (-5 1/6)
d) (-2 1/5) : 3 3/10
e) (-1 5/7) : (-1 1/14)
f) 3 3/8 : (-2 13/16 )

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Answer 1

1.
a) 1/4 x (-1/5) = - 1/20
b) (-3/5) x (-5/11) = 15/55  = 3/11
c)  (-4/9) x 3/14 = (-4/3)  x 1/14 = - 4/42 = -2/21
d) (-2/5) : 5/8 = (-2/5) x 8/5 = -16/25
e)  8/9 : (-10/21) = 8/9 x (-21/10) = 4/9 x (-21/5) = -84/45 = - 1   39/45
f) (-5/12) : (-25/36) = (-5/12) x (-36/25) = (-1/12) x (-36/5) = (-1/1) x (-3/5) = 3/5

2.
a) 1 1/3 x (-3/8) = 4/3 x (-3/8) = 4/1 x (-1/8) = 1 x (-1/2) = -1/2
b)  (-2 4/5) x (-1 3/7) = (-14/5) x (-10/7) = (-2/5) x (-10/1) = (-2/1) X (-2/1) = 4
C)  (-4 1/2) x (-5 1/6) = (-9/2) x (-31/6) = (-3/2) x (-31/2) = 93/4 = 23  1/4
d) (-2 1/5) : 3 3/10 = (-11/5) : 33/10 = (-11/5) x 10/33 = (-1/5) x 10/3 = -10/15 = -2/3
e) (-1 5/7) : (-1 1/14) = (-12/7) : (-15/1) = (-12/7) x (-1/15) = 12/105 
f)   3 3/8 : (-2 13/16 ) = 27/8 : (-45/16 ) = 27/8 x (-16/45) = 27/1 x (-2/45) = -54/45 = -1  1/5