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a fost răspuns

X+2x+3x+...+100x=1000

Dau 49 DE PUNCTE!!

Răspuns :

Uhaciioan
X+2x+3x+...+100x=1000scot x factor si calculez suma
X(1+2+3+...+100)=1000s=(1+100)+(2+99)+(3+98)+......+(48+53)+(49+52)+(50+51)=101+101+101+....+101
=101*50=5050

sunt 100 nr deci 50 sume de 101

deci ec este 5050x=1000
x=1000/5050=20/101