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a)5/6*10/6=50/36
b)3/4*7/4*8/4=168/64
c)52/56:1/100=520/56
d)32/22:13/52=1664/286
e)1/38*2/39:3/40=2/1482*40/3=80/4446
1/9 + 2/3 = 1/9 + 6/9= 7/9
2/4 + 1/2 = 1/2 *2 = 1
25/5 : 25/5 = 25/5 * 5/25 = 125/125 = 1
12/10 + 2/5 = 6/5 + 2/5 = 8/ 5 = 1 cały i 3/5
10/50 + 2 = 10/ 50 + 100 /50 = 110/50 = 11/5 = 2 całe i 1/5
11/3 + 2/6 = 22/6 + 2/6 = 24/6 = 8
1/3 + 3/2 * 1/2= 1/3 + 3/4 = 4/12 + 9/12 = 13/12 = 1 cały i 1/12
2/5+1/5-10/5=3/5 -10/5 = -7/5 = - 1 cała i 2/5