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(X+1)+(X+2)+(X+3)+.....+(X+100)=99X-5728

Răspuns :

Crazydalia33
x+1+x+2+...........+x+100=100x+(1+2+............+100)=100x+101.100/2
100x+101.50=99x+5728
x=5728-5050=678

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