U(8^1223)=8
U(9^203)=9
3×2^25+2×5^100=Nu stiu
a=(99×100:2)×2+100
a=(99×50)×2+100
a=4.950×2+100
a=9.900+100
a=10.000
a=50×51:2-25×50
a=25×51-25×50
a=25×(51-50-1)
a=25×0=0
a=1+2+3+...+25-75
a=25×26:2-75
a=25×13-75
a=975-75=900
x:(3x)^5=(3^2)^5×3^2×3^3
x:(3x)^5=3^10×3^2×3^3
x:(3x)^5=3^15
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