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Calculati dand factor comun:

a)3745×99+3745;
b)49506×101-49506;
c)145×8+145×12+145×30.


Răspuns :

a) 3745(99+1)=  3745 *100= 374500

b)49506(101-1)= 49506 *100= 4950600

c)145(8+12+30)= 145* 50= 7250