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4)Calculeaza,grupand convenabil factorii.astfel incat sa efectuezi mai usor imultitrile.
exemplu 5*47*20=(5*20)*47=100*47=4 700 5*99*2 4*78*25 97*2*5 50*71*2 urgenttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttt dau coroana!!!!!!!!!!!!!!!!!