A) 15·(1041+204)=15·1245=15·(1000+200+40+5)=15·1000+15·200+15·40+15·5=
=15000+3000+600+75=18675.
Б) 419·458+581·458=(419+581)·458=1000·458=458000.
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A) 15·(1041+204)=15·1245=15·(1000+200+40+5)=15·1000+15·200+15·40+15·5=
=15000+3000+600+75=18675.
Б) 419·458+581·458=(419+581)·458=1000·458=458000.