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13+14+15+.......+1012

Răspuns :

JolieJulie
13+14+...+1012=
1+2+...+13+14+....1012-(1+2+...+12)
1012*1013/2-12*13/2=
512 578-78=
512 500
=1+2+3+...+12+13+14+...1012-(1+2+3+...+12)=

[tex]=\frac{1012*1013}{2}-\frac{12*13}{2}=[/tex]

=506×1013-6×13=
=512.578-78=

[tex]\boxed{=512.500}[/tex]

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