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X = 1+2+3+4+.........+1234
Aflati x


Răspuns :

[tex]x=1+2+3+...+1234[/tex]

[tex]x=1234+1233+1232+...+1[/tex]

[tex]2x=1235+1235+...+1235(1234 \ termeni)[/tex]

[tex]x=\frac{1235*1234}{2}=761995[/tex]
x=1+2+3+4+......+1234
x=1234+1233+1232+...+1
2x=1235+1235+...+1235
x={1235•1234}{2}=761995