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b) 3/4 * 7 = 3/4 * 7/1 = 21/4 = 5 1/20
c) 2 * 5/8 = 2/1 * 5/8 = 1/1 * 5/4 = 5/4 = 1 1/4
d) 2 3/4 * 4 = 11/4 * 4/1 = 11/1 * 1/1 = 11/1 = 11
e) 1 7/9 * 3 = 16/9 * 3/1 = 16/3 * 1/1 = 16/3 = 5 1/3
f) 3/7 * 3 3/8 = 3/7 * 27/8 = 81/56 = 1 25/56
B) * 7 = = 5
C) 2 * = =
D) 2 * 4 = * 4 = = 11
E) 1 * 3 = * 3 = = 5
F) * 3 = * = = 1
myślę że jest dobrze :)