Sagot :
[tex](2188,5)^{2}-(3,5)^{2}-(2188,5)^{2}+(5,5)^{2}= \\(5,5)^{2}-(3,5)^{2}=(5,5+3,5).(5,5-3,5)=9.2=18[/tex]
2183 =a
2185=a artı 2
2192=a artı9
2194=a artı 11
carptıgımız da hepsiniyukarıdaki gibi cevap 7 cıkıyor
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