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(x+1)+(x+2)+(x+3)...+(x+100)=1990+406x

Răspuns :

(x+1)+(x+2)+(x+3)+....+(x+100)=1990+406x
100x+(1+2+3+...+100)=1990+406x

1+2+3+...+100=100×101:2
=10100:2
=5050

100x+5050=1990+406x
306x=3060 /:306
x=10


Sper ca te-am ajutat