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Tính A = \(\frac{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{49}+\frac{1}{50}}{\frac{1}{49}+\frac{2}{48}+\frac{3}{47}+...+\frac{48}{2}+\frac{49}{1}}\)
15 tháng 10 2015 lúc 10:32
tính : S = \(\frac{1}{2}+\frac{2}{3}+\frac{3}{4}+.....+\frac{48}{49}+\frac{49}{50}\)
Tính nhanh :
a) 50 . 301
b) 32 . 48 + 52 . 32 + 68 .100
Cho S = \(\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{48}+\frac{1}{49}+\frac{1}{50}\)và P = \(\frac{1}{49}+\frac{2}{48}+\frac{3}{47}+...+\frac{48}{2}+\frac{49}{1}\). Tính \(\frac{S}{P}\)
tính
\(a,\left(\frac{51}{56}+\frac{8}{21}+\frac{16}{48}\right).\frac{32}{65}\)
\(b,\left(\frac{31}{20}-\frac{26}{45}\right).\frac{36}{49}\)
\(c,\frac{5}{39}.\left(7\frac{4}{5}.1\frac{2}{3}+8\frac{1}{3}.7\frac{4}{5}\right)\)
Cho S=\(\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+.........+\frac{1}{48}+\frac{1}{49}+\frac{1}{50}\) VÀ
P=\(\frac{1}{49}+\frac{2}{48}+\frac{3}{47}+......+\frac{48}{2}+\frac{49}{1}\)
Tính \(\frac{S}{P}\)
Tính hợp lí:
a.(2^16 x 3^4 - 32^4) : [(48^2 + 32^2).(24^2 - 16^2)
b.12,5^2 - 9,7^2 - 2,5^2 + 0,3^2
\(TÍNH\: GIA\: TRI\: BIEU\: THƯC\: A=\: \: \: \frac{1}{\frac{1}{\frac{100}{1}+}}+\frac{1}{\frac{2}{\frac{49}{2,}+}}+\frac{1}{\frac{3}{\frac{48}{3}+...+}}+...+\frac{1}{\frac{49}{\frac{2}{48}+\:\:}}+\frac{1}{\frac{50}{\frac{1}{50\:}}}\)\(\)
Tính A=1/(1*2*3)+1/(2*3*4)+1/(3*4*5)+...+1/(48*49*50)