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Dorinabalcan70
a fost răspuns

calculati:
42+43+44+...+347

Răspuns :

[tex] \frac{347x348}{2} - \frac{42x43}{2} = \frac{347x174}{1} - \frac{21x43}{1}=60378-903=59475 [/tex]
PewDiePie9912
42+43+44+...+347=13202

348-41=307
1+2+3+...+307=
307+(307+308):2=615
615+307X41=13202

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