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b) 1 1/3 - 0,1 = 4/3 - 1/10 = 40/30 - 3/30 = 27/30
c) 1,25 x 3/4 = 1 25/100 x 3/4 = 1 1/4 x 3/4 = 5/4 x 3/4 = 15/16
d) 0,7 : 7/9 = 7/10 x 9/7 = ( 7 skracasz z 7 na górze masz 1 na dole masz 1 ) = 9/10
e) ( 2,125 + 5/8 ) x 0,8 = (2,125 + 0,625 ) x 0,8 = 2,75 x 0,8 = 2,2
f) 5 1/4 - ( 0,77 + 1,33 ) = 5,25 - 2,1 = 3,15
g) 3,5 x 1/7 + 1,8 x 2/9 = 5,95 + 1 8/10 x 2/9 =
5,95 + 1 4/5 x 2/9 = 5,95 + 9/5 x 2/9 = ( 9 skracasz z 9 na górze masz 1 na dole masz 1 ) = 5,95 x 2/5 = 5,95 x 0,2 = 1.19
h) 10,6 : ( 2 1/4 + 2,75 ) = 10.6 : ( 2,25 + 2,75) = 10,6 : 5 = 2,12
i) 1,09 + 7,2 : 1 3/5 = 1,09 + 7,2 : 1,6 = 1,09 + 4.5 = 5.59
j) 0,5 x 0,5 + 1/5 x 1 1/5 = 0,5 x 0,5 + 0.2 x 1,2 = 0,25 + 0,24 = 0.49
k) ( 3,8 - 2,9 ) x ( 3/8 + 0,125 ) = 0.9 x ( 0,375 + 0,125) = 0,9 x 0,5 = 0,45
l) (8 1/3 - 8,1 ) x ( 9 - 4 5/7 ) = (25/3 - 81/10 ) x ( 9/1 - 31/7) = ( 250/30 - 243/30 ) x (63/7 - 31/7 ) = 7/30 x 32/7 = ( 7 skracasz z 7 na górze masz 1 i na dole 1 ) = 32/30= 1 2/30 = 1 1/15