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12 * 2 3/4 : 2 3/4 = 12 * 1 = 12
4 1/2 : 1 1/2 - 1 3/4 = 9/2 : 3/2 - 1 3/4 = 9/2 * 3/2 - 1 3/4 = 3 - 1 3/4 = 1 1/4
20 - 6 3/4 : 4 1/2 = 20 - 27/4 * 2/9 = 20 - 1 1/2 = 18 1/2
10:2/3*1 1/2=10*3/2*3/2=15*3/2=45/2=22 1/2
b)
12* 2 3/4:2 3/4=12*11/4:11/4=33:11/4=33*4/11=12
c)
4 1/2:1 1/2-1 3/4=9/2:3/2-1 3/4=9:3/2:2-1 3/4=3/1-1 3/4=3-1 3/4=
=2 4/4-1 3/4=1 1/4
d)
20-6 3/4:4 1/2=20-27/4:9/2=20-27/4*2/9=20-3/2=20-1 1/2=19 2/2-1 1/2=18 1/2
Liczę na NAJ :)