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

X1x2x4140x860 class=

Răspuns :

(x+1)+(x+2)...(x+41)=40x+860 
x·41+(1+2+...+41)=40x+860
41x-40x=860-(1+2+...+41)
x=860-861
x=-1