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ሒሳብ/ይህን ያውቁ ኖሯል?
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በር:ሒሳብ
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{\displaystyle {\frac {1}{2}}+{\frac {1}{4}}+{\frac {1}{8}}+{\frac {1}{16}}+{\frac {1}{32}}\cdots =1.}
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{\displaystyle 1-{\frac {1}{2}}+{\frac {1}{3}}-{\frac {1}{4}}+{\frac {1}{5}}-\cdots =\ln 2.}
=0.69314....
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{\displaystyle 1-{\frac {1}{3}}+{\frac {1}{5}}-{\frac {1}{7}}+{\frac {1}{9}}+\cdots ={\frac {\pi }{4}}.}
= 0.78539....
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{\displaystyle {\frac {1}{1^{2}}}+{\frac {1}{2^{2}}}+{\frac {1}{3^{2}}}+{\frac {1}{4^{2}}}+\cdots ={\frac {\pi ^{2}}{6}}}
=1.64493....
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{\displaystyle {\frac {1}{0!}}+{\frac {1}{1!}}+{\frac {1}{2!}}+{\frac {1}{3!}}+\cdots =e.}
=2.71828.....
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{\displaystyle {\frac {1}{1*2}}+{\frac {1}{3*4}}+{\frac {1}{5*6}}+{\frac {1}{7*8}}+\cdots =ln{2}.}
= 0.6931471.....
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{\displaystyle {\frac {1}{1*2*3}}+{\frac {1}{4*5*6}}+{\frac {1}{7*8*9}}+\cdots ={\frac {1}{4}}({\frac {\pi }{\sqrt {3}}}-{ln{3}}).}
= 0.178796.....
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{\displaystyle {\sqrt {1+2{\sqrt {1+3{\sqrt {1+4{\sqrt {1+5{\sqrt {1+6{\sqrt {1+\cdots }}}}}}}}}}}}=3.}
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{\displaystyle 1+{\cfrac {1}{2+{\cfrac {1}{2+{\cfrac {1}{2+{\cfrac {1}{2+{\cfrac {1}{2+{\ddots }}}}}}}}}}}={\sqrt {2}}.}
= 1.41421...
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{\displaystyle {\sqrt {2}}^{{\sqrt {2}}^{{\sqrt {2}}^{{\sqrt {2}}^{{\sqrt {2}}^{{\sqrt {2}}^{{\sqrt {2}}^{\cdot ^{\cdot ^{\cdot }}}}}}}}}=2}