1 cộng 5555555574839393932820-22048012843287512863526157632185761235476128376 cộng 3274817264871236487216415234123748612385`287461237654123756132651327651237652376541826 = ???????????????????????????????????????????????????????????????????????????????????????????????????????????/
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1/2 + 1/6 + 1/12 + ... + 1/132
= 1/1.2 + 1/2.3 + 1/3.4 + ... + 1/11.12
= 1/1 - 1/2 + 1/2 - 1/3 + 1/3 - 1/4 + ... + 1/11 - 1/12
= 1 - 1/12
= 11/12
1/90 + 1/110 + 1/132 + ... + 1/10100
= 1/9.10 + 1/10.11 + 1/11.12 + ... + 1/100.101
= ... [như trên]
= 1/9 - 1/100
= 49/450
a: \(A=\dfrac{5}{7}-\dfrac{2}{7}+\dfrac{8}{11}+\dfrac{3}{11}+\dfrac{1}{2}=\dfrac{3}{7}+\dfrac{1}{2}+1=\dfrac{6+7+14}{14}=\dfrac{27}{14}\)
b: \(B=\dfrac{11}{17}+\dfrac{6}{17}-\dfrac{8}{19}-\dfrac{30}{19}+\dfrac{-3}{4}=1-2-\dfrac{3}{4}=-1-\dfrac{3}{4}=-\dfrac{7}{4}\)
c: \(C=1-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{4}+...+\dfrac{1}{49}-\dfrac{1}{50}=\dfrac{49}{50}\)
a: \(100+98+96+...+2-97-95-...-1\)
\(=100+\left(98-97\right)+\left(96-95\right)+...+\left(2-1\right)\)
\(=100+1+...+1\)
\(=100+49=149\)
b: \(1+2-3-4+5+6-7-8+9+10-11-12+...+...-299-300+301+302\)
\(=\left(1+2-3-4\right)+\left(5+6-7-8\right)+...+\left(297+298-299-300\right)+603\)
\(=603+\left(-4\right)+\left(-4\right)+...+\left(-4\right)\)
\(=603-4\cdot75=603-300=303\)
\(=\frac{-\left(101-100+99-98+...+3-2+1\right)}{101-100+99-98+...+3-2+1}=-1\)
ban viet linh tinh a
chịu thui . máy tính tớ ko đủ chữ số . tự tính nhé