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b) 10/72
c) 4/19 * 2 3/8=4/19*19/8=1/2 (po skróceniach)
d) 3 3/8*8/9=27/8*8/9=3/1=3
e) 7/11*12/24=84/264=21/66=7/22
f)1 1/2*2/3=3/2*2/3=1
g) 3 1/5*2 1/4=16/5*9/4=36/5=7 1/5
h) 1/9*9 1/2=1/9*19/2=19/18
i) 3/7 : 7/3= 3/7*3/7=9/49
j) 4 1/4 : 7/10=21/5*10/7=6/1=6
k) 1/2:1 1/4=1/2*4/5=2/5
l) 1 1/8:8=9/8*1/8=9/64
m) 4/8:1/2=4/8*2=4/4=1
n) 3 3/11:3=36/11*1/3=12/11=1 1/11
o) 2 3/7:4 6/7=17/7:34/7=17/7*7/34=1/2
pozdrawiam!
g) 3 1/5 × 2 1/4 = 16/5 × 9/4 = 144/20 = 7 14/20 = 7 7/10