Oblicz nieznaną liczbę i sprawdz:
a+ 3 3/4= 5 1/4
b-1 4/7= 2 6/7
1-c= 1/5
a=5 1/4- 3 3/4
a=4 5/4 -3 3/4
a= 1 2/4
b= 2 6/7 + 1 4//7
b=4 3/7
-c= 1/5+1
-c= 1 1/5: (-1)
c=- 1 1/5
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a=5 1/4- 3 3/4
a=4 5/4 -3 3/4
a= 1 2/4
b= 2 6/7 + 1 4//7
b=4 3/7
-c= 1/5+1
-c= 1 1/5: (-1)
c=- 1 1/5