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calculati folosind factorul comun:a)23×54+54×77;2×998+98×998;99×999+99;;509×14+9×14-500×14;

Răspuns :

Bogdan505
54x(23+77)=54x100=5400
998x(2+98)=998+100=99800
14x(509+9-500)=14x(518-500)=14x18=252
Icecon2005
a)23×54+54×77=54(23+77)=54×100=5400

2×998+98×998=998(2+98)=998×100=99800

99×999+99=99(999+1)=99×1000=99000

509×14+9×14-500×14=14(509+9-500)=14×18=252

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