Ôn tập toán 6
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Tìm tỉ số a/b biết
A=34/7.14 +51/13.22 +85:22.37 +68/37.49
B=39/7.16 +65/16.31 +52/31.43 +26/43.49
So sánh : \(\left(\dfrac{-3}{8}\right)^3\) và \(\left(\dfrac{8}{243}\right)^3\)
Tính : \(A=\dfrac{34}{7.13}+\dfrac{51}{13.22}+\dfrac{85}{22.37}+\dfrac{68}{37.49}\)
\(M=\dfrac{26}{7.11}+\dfrac{65}{11.21}+\dfrac{39}{21.27}+\dfrac{143}{37.49}\)
\(N=\dfrac{51}{7.16}+\dfrac{17}{16.19}+\dfrac{35}{19.34}+\dfrac{85}{34.49}\)
Tính : \(P=\dfrac{M}{N}+\dfrac{29}{34}\)
HELP
cho:
Adfrac{40}{31.38}+dfrac{35}{39.46}+dfrac{30}{2392}+dfrac{25}{29.62}
Bdfrac{91}{19.31}+dfrac{65}{19.43}+dfrac{29}{989}+dfrac{143}{1311}
Tính tỷ số dfrac{A}{B}
nhanh nha mk cần rất gấp, mk chỉ online khoảng 30 phút nữa thôi, mai nộp rồi
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cho:
A=\(\dfrac{40}{31.38}+\dfrac{35}{39.46}+\dfrac{30}{2392}+\dfrac{25}{29.62}\)
B=\(\dfrac{91}{19.31}+\dfrac{65}{19.43}+\dfrac{29}{989}+\dfrac{143}{1311}\)
Tính tỷ số \(\dfrac{A}{B}\)
nhanh nha mk cần rất gấp, mk chỉ online khoảng 30 phút nữa thôi, mai nộp rồi
a)Chứng minh \(\dfrac{1}{2}< \dfrac{1}{51}+\dfrac{1}{52}+\dfrac{1}{53}+..........+\dfrac{1}{100}< 1\)
b)So sánh A=\(\dfrac{10^{19}+1}{10^{20}+1}\) B=\(\dfrac{10^{20}+1}{10^{21}+1}\)
1.Tính nhanh:
e)\(\dfrac{\dfrac{1}{6}-\dfrac{1}{39}+\dfrac{1}{51}}{\dfrac{1}{8}-\dfrac{1}{12}+\dfrac{1}{68}}\)
f)\(\dfrac{7}{8}+\dfrac{7}{56}+\dfrac{7}{154}+...+\dfrac{7}{1400}\)
Tìm x biết
\(\dfrac{x-1}{12}+\dfrac{x-1}{20}+\dfrac{x-1}{30}+\dfrac{x-1}{42}+\dfrac{x-1}{56}+\dfrac{x-1}{72}=\dfrac{16}{9}\)
Help me!! Mk đang cần gấp
Tính nhanh
a) dfrac{-3}{7}+dfrac{15}{26}-left(dfrac{2}{13}-dfrac{3}{7}right)
b) 2.dfrac{3}{7}+left(dfrac{2}{9}-1dfrac{3}{7}right)-dfrac{5}{3}:dfrac{1}{9}
c) dfrac{-11}{23}.dfrac{6}{7}+dfrac{8}{7}.dfrac{-11}{23}-dfrac{1}{23}
d) left(dfrac{377}{-231}-dfrac{123}{89}+dfrac{34}{791}right).left(dfrac{1}{6}-dfrac{1}{8}-dfrac{1}{24}right)
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Tính nhanh
a) \(\dfrac{-3}{7}+\dfrac{15}{26}-\left(\dfrac{2}{13}-\dfrac{3}{7}\right)\)
b) \(2.\dfrac{3}{7}+\left(\dfrac{2}{9}-1\dfrac{3}{7}\right)-\dfrac{5}{3}:\dfrac{1}{9}\)
c) \(\dfrac{-11}{23}.\dfrac{6}{7}+\dfrac{8}{7}.\dfrac{-11}{23}-\dfrac{1}{23}\)
d) \(\left(\dfrac{377}{-231}-\dfrac{123}{89}+\dfrac{34}{791}\right).\left(\dfrac{1}{6}-\dfrac{1}{8}-\dfrac{1}{24}\right)\)
Chứng tỏ rằng \(\dfrac{1}{1.2}+\dfrac{1}{2.3}+\dfrac{1}{3.4}+......+\dfrac{1}{99.100}=\dfrac{1}{51}+\dfrac{1}{52}+......+\dfrac{1}{100}\)