Question

calculiaza rapid asocind termenii conoavabil. a)1001+1002+1003+1997+1998+1999= b)20111+20222+20333+19889+19778+19667= c)10200+3400+20800+5600= d)230250+2451+2451+20750+2549+5000

Answer 1

a) 1001+1002+1003+1997+1998+1999=
=1001+1999 + 1002+1998 + 1003+1997=
=3000+3000+3000=
=6000+3000=
=9000

b) 20111+20222+20333+19889+19778+19667=
=20111+19889 + 20222+19778 + 20333+19667=
=40000+40000+40000=
=80000+40000=
=120000

c) 10200+3400+20800+5600=
=10200+20800 + 3400+5600=
=31000+9000=
=40000

d) 20250+2451+2451+20750+2549+5000=
=20250+20750 + 2451+2549 + 5000+2451=
=41000 + 5000 + 7451=
=46000 +7451=
=53451