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(x+1)+(x+2)+........+(x+41)=40x+860

Răspuns :

x+1+x+2+x+3+....x+41=40x+860
41x+1+2+3+...+41=40x+860
41x+(1+2+3+...+41)-40x=860
x+41x42:2=860
x+861=860
x=860-861
x=-1

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