Explicație pas cu pas:
10×9+100×2=90+200=290
10×8+100×2=80+200=280
10×9+10×8=90+80=170
100×2+7×10=200+70=270
10×8+10×6=80+60=140
5×10+10×8=50+80=130
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Explicație pas cu pas:
10×9+100×2=90+200=290
10×8+100×2=80+200=280
10×9+10×8=90+80=170
100×2+7×10=200+70=270
10×8+10×6=80+60=140
5×10+10×8=50+80=130