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7 + 14 + 21 + 28 + .... + 7000
dau coronita


Răspuns :

7 + 14 + 21 + 28 + .... + 7000
= 7( 1+2+3+..+1000)
=7 
× [tex] \frac{1000*1001}{2} [/tex]
=7×[tex] \frac{1001000}{2} [/tex]
=7×500500
=250250
Baftă!
7 + 14 + 21 + 28 + .... + 7000
= 7x( 1+2+3+..+1000)
7x1000x1001:2=3503500