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x la a doua+25=2+4+6+..+50 va rogggggggggg

Răspuns :

x^+25=2(1+2+3+...+25), X^2+25=2*25(25+1)/2, x^2+25=25*26, x^2+25=650, x^2=625, x=+-25
x la 2+25=2*(1+2+3+...+25)
x la  2+25=2*(25*26:2)
x  la 2+25=2* (25*13)
x  la  2+25=2*325
x  la 2+25=650
x la  2=625
25 la  2=625
x=25
Sper  ca  te-am  ajutat.