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Aflati-l pe x stiind ca: x*(1+2+3...+100)=60.600

Răspuns :

suma lui gauss spune ca 1+2+3+,,,+n=n*(n+1):2


x*(1+2+3+,,,+100)=60600
x*(100*101:2)=60600
x*(10100:2)=60600
x*5050=60600
x=60600:5050
x=12
x*(1+2+3+....100)=60600
↔x*{[(100+1)x100:2]}=60600
x*[(101x100):2]=60000
x*(10100:2)=60600
x*5050=60600
x=60600:5050
x=12