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calculeasza si  fa proba 
56/b=9 rest 2
94/a=5 rest 4
88/d=5 rest 3
97/c=3 rest 1
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Răspuns :

56/b=9rest2
56=9b+2
54=9b
b=6
56/6=9rest 2
94/a=5rest4
94=5a+4
90=5a
a=18
94/18=5 rest4

88/d=5rest3
88=5d+3
85=5d
d=17
88/17=5rest3

97/c=3rest1
97=3c+1
96=3c
c=32
97/32=3rest1

56/b=9rest2
56=9b+2
54=9b
b=6
56/6=9rest 2
94/a=5rest4
94=5a+4
90=5a
a=18
94/18=5 rest4
88/d=5rest3
88=5d+3
85=5d
d=17
88:17=5rest3
97:c=3rest1
97=3c+1
96=3c
c=32
97:32=3 rest 1