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(1/2×3+1/3×4+.....+1/31×32)-15/32= ?

Răspuns :

(1/2-1/3+1/3-1/4+... +1/31-1/32)-15/32=
=(1/2-1/32)-15/32
=(16/32-1/32)-15/32
=15/32-15/32
=0