Răspunsuri

2014-04-20T14:00:57+03:00
X²=(1+101)*50/2=102*25
x²=2550
√x²=√2550
/x/=5√51  ⇒x∈{5√51, -5√51}
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2014-04-20T18:33:16+03:00
X la 2=1+3+5+.....+101 x la 2=101+99+97+95+.........+1 2x la 2=102+102+102+....+102 x la 2=51•102/2=2601 x=√2601 x=……
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