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3•10la puterea4+5•10la puterea3+10la puterea2+7•10+2

Răspuns :

3*10⁴+5*10³+10²+7*10 + 2=10*(3*10³+5*10²+10+7)+2=
=10*(3000+500+10+7)+2=10*3517+2= 35172