Răspuns :
a-b=621
a:b = 89 rest 5 => a = 89b+5
89b+5-b=621
88b=616
b=7
a=621+7
a=628
a:b = 89 rest 5 => a = 89b+5
89b+5-b=621
88b=616
b=7
a=621+7
a=628
a-b=621
a÷b=89 rest 5
a=b+621
a=b×89+5
b+621=b×89+5 |-5
b+616=b×89 |-b
b×88=616
b=7
a=628
Proba : 628 ÷ 7 = 88 rest 7
a÷b=89 rest 5
a=b+621
a=b×89+5
b+621=b×89+5 |-5
b+616=b×89 |-b
b×88=616
b=7
a=628
Proba : 628 ÷ 7 = 88 rest 7