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Eliza10
a fost răspuns

Calculati dànd factor comun:
a) 129×130+220×129-350×99=
b) 3022×102-3022+101×1987-5000×99=

Răspuns :

129*(130+220)-350*99=129*350-350*99=350*(129-99)=350*30=10500
3022*(102-1)+101*1987-5000*99=3022*101+101*1987-5000*99=3022*101+101*1987-5000*(101-2)=3022*101+101*1987-5000*101+10000=
101*(3022+1987-5000)+10000=101*9+10000=10909

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