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Hey,there are some note about abc.....xyz^2 for you!!!

ab^2=(ab+b)X10Xa+b^2

etc:37^2 =(37+7)X10X3+7^2 =44X30+4 =1369

abc^2=(abc+c)X10Xab+c^2

etc:329^2=(329+9)X10X32+9^2 =338X320+81 =108241

abcd^2=(abcd+d)X10Xabc+d^2

etc:7456^2=(7456+6)X10X745+6^2 =7462X7450+36 =55591936

so abc......xyz^2=(abc......xyz+z)X10Xabc......xy+z^2

Note by Zhi Yang Marcus
2 years, 10 months ago

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