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Simplificati fractia 5+10+15+....+500 supra 7+14+21+....+700

Răspuns :

[tex]\frac{5+10+15+...+500}{7+14+21+...+700}=\frac{5(1+2+3+...+100)}{7(1+2+3+...+100)}=\frac{5}{7}[/tex]
5+10+15+....+500 supra 7+14+21+....+700=5(1+2+3+........100)supra 7 (1+2+3+.....100)= 5supra7