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(19²-17²)x(10³-15²) ajutati

Răspuns :

(361-289)x(1000-225)=72×775=45800
(19×19-17×17)×(10×10×10-15×15)=
=(361-289)×(1000-225)=
=72×775=
=55800
R-s:55800