2025=(20+25)2=452=(1+2+3+4+5+6+7+8+9)2=(9×102)2=13+23+33+43+53+63+73+83+93 √2025=45=(2+1)2⋅5=(2+0!)2⋅5
2025=402+202+52=(62+22)2+(42+22)2+(12+22)2=(22+42+52)2
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