TÍNH TỔNG:
A = \(\frac{6}{5\times8}\)+\(\frac{22}{8\times19}\)+\(\frac{24}{19\times31}\)+\(\frac{140}{31\times101}\)+\(\frac{198}{101\times200}\)
Tính tỷ số \(\frac{A}{B}\)
\(A=\frac{4}{9\times31}+\frac{5}{31\times12}+\frac{9}{36\times15}+\frac{13}{15\times58};B=\frac{5}{27\times8}+\frac{7}{8\times39}+\frac{9}{39\times12}+\frac{10}{12\times58}\)
TÍNH TỔNG
A = \(\frac{6}{5.8}\)+ \(\frac{22}{8.19}+\frac{24}{19.31}+\frac{140}{31.101}+\frac{198}{101.200}\)
AI NHANH CHO 5 TICK
giữ lời ko làm chó
gọi A = 6 / ( 5*8 ) + ... + 198 / ( 101 * 200 )
=> A / 2 = 3 / ( 5*8 ) + 11 / ( 8 * 19 ) + ... + 99 / ( 101*200 )
A / 2 = 1/5 - 1/8 + 1/8 - 1/11 + ... + 1 / 101 - 1 / 200
A / 2 = 1/ 5 -1 / 200
A / 2 = 39 /200
A = 39 / 100
đã làm bài này rồi , đúng, giờ thì k hộ cái , ko giết đấy
Ta co:
1/2A= 3/5×8 + 11/8×19 + 12/19×31 +70 /31×101+ 99/101×200
1/2A= 1/5 - 1/8 + 1/8 - 1/19 + 1/19 - 1/31 + 1/31 -1/101 + 1/101 - 1/200
1/2A= 1/5 - 1/200
1/2A= 39/200
A= 39/200 ÷ 1/2
A= 39/100
tính tổng
\(A=\frac{4}{7\times31}+\frac{6}{7\times41}+\frac{9}{10\times41}+\frac{7}{10\times57}\)
\(B=\frac{7}{19\times31}+\frac{5}{19\times43}+\frac{3}{23\times43}+\frac{7}{10\times57}\)
tính tổng
A = \(\frac{6}{5.8}+\frac{22}{8.19}+\frac{24}{19.31}+\frac{140}{31.101}+\frac{198}{101.200}\)
ai nhanh dc tick nhé
nhanh dc 5 tick
\(A=\frac{6}{5.8}+\frac{22}{8.19}+\frac{24}{19.31}+\frac{140}{31.101}+\frac{198}{101.200}\)
\(\Rightarrow A=\frac{1}{5}-\frac{1}{8}+\frac{1}{8}-\frac{1}{19}+\frac{1}{19}-\frac{1}{31}+\frac{1}{31}-\frac{1}{101}+\frac{1}{101}-\frac{1}{200}\)
\(\Rightarrow A=\frac{1}{5}-\frac{1}{200}\)
\(\Rightarrow A=\frac{39}{200}\)
A=2.(3\5.8+11\8.19+12\19.31+70\31.101+99\101\200)
A=2.(1\5-18+1\8-1\19+....+1\101-1\200)
A=2.(1\5-1\200)
A=2.39\200
A=39\100
Chúc bạn học tốt
Tính
\(\frac{6}{5.8}+\frac{22}{8.19}+\frac{24}{19.31}+\frac{140}{31.101}+\frac{198}{101.200}\)
\(E=\frac{6}{5.8}+\frac{22}{8.19}+\frac{24}{19.31}+\frac{140}{31.101}+\frac{198}{101.200}\)
\(=2.\left(\frac{3}{5.8}+\frac{11}{8.19}+...+\frac{99}{101.200}\right)\)
\(=2.\left(\frac{1}{5}-\frac{1}{200}\right)\)
\(=2.\frac{39}{200}=\frac{39}{100}\)
\(E=\frac{6}{5.8}+\frac{22}{8.19}+\frac{24}{19.31}+\frac{140}{31.101}+\frac{198}{101.200}\)
\(=2.\left(\frac{3}{5.8}+\frac{11}{8.19}+\frac{12}{19.31}+\frac{70}{31.101}+\frac{99}{101.200}\right)\)
\(=2\left(\frac{1}{5}-\frac{1}{8}+\frac{1}{8}-\frac{1}{19}+\frac{1}{19}-\frac{1}{31}+\frac{1}{31}-\frac{1}{101}+\frac{1}{101}-\frac{1}{200}\right)\)
\(=2\left(\frac{1}{5}-\frac{1}{200}\right)\)
\(=2.\frac{39}{200}\)
\(=\frac{39}{100}\)
Cho
A= \(\frac{4}{31\times7}+\frac{6}{7\times41}+\frac{9}{10\times41}+\frac{7}{10\times57}\)
B= \(\frac{7}{19\times31}+\frac{5}{19\times43}+\frac{3}{13\times43}+\frac{11}{23\times57}\)
Tính \(\frac{A}{B}\)
LM ƠN GIÚP TỚ NHÉ, TỚ CẦN GẤP LẮM, TỚ SẼ TIK CHO!!!!!!!
TÍNH NHANH (NẾU CÓ THỂ): \(\frac{19}{20}-\frac{5}{6\times7}-\frac{5}{7\times8}-\frac{5}{8\times9}-...-\frac{5}{59\times60}\)
\(\frac{19}{20}-\frac{5}{6.7}-\frac{5}{7.8}-\frac{5}{8.9}-...-\frac{5}{59.60}\)
= \(\frac{19}{20}-\left(\frac{5}{6.7}+\frac{5}{7.8}+\frac{5}{8.9}+...+\frac{5}{59.60}\right)\)
= \(\frac{19}{20}-5\left(\frac{1}{6.7}+\frac{1}{7.8}+\frac{1}{8.9}+...+\frac{1}{59.60}\right)\)
= \(\frac{19}{20}-5\left(\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}+\frac{1}{8}-\frac{1}{9}+...+\frac{1}{59}-\frac{1}{60}\right)\)
= \(\frac{19}{20}-5\left(\frac{1}{6}-\frac{1}{60}\right)\)
= \(\frac{19}{20}-5.\frac{3}{20}\)
= \(\frac{19}{20}-\frac{3}{4}\) = \(\frac{1}{5}\)
Tính giá trị biểu thức A=\(\frac{99}{101}+\frac{404}{808}+\frac{1110\times101}{8080\times101}\)