\(\Leftrightarrow\left\{{}\begin{matrix}a=\dfrac{-5}{9}\cdot27=-15\\b=\dfrac{-45\cdot9}{-5}=9\cdot9=81\end{matrix}\right.\)
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Bài 1: Tìm a,b biết:
a, \(\dfrac{a-1}{-2}\) = \(\dfrac{-8}{a-1}\)
b, \(\dfrac{a}{27}\) = \(\dfrac{-5}{9}\) = \(\dfrac{-45}{b}\)
2. thực hiện phép tính
a. \(\dfrac{2}{5}-\dfrac{3}{7}+\dfrac{9}{45}\)
b\(\dfrac{5}{15}+\dfrac{14}{25}-\dfrac{12}{9}+\dfrac{2}{7}+\dfrac{11}{25}\)
c.\(\dfrac{21}{47}+\dfrac{9}{45}+\dfrac{26}{47}+\dfrac{45}{5}\)
DX
23 tháng 2 2021 lúc 13:02
Tìm \(x,y\in N\):
a) 32x+1 . 7y = 9 . 21x
b) \(\dfrac{27^x}{3^{2x-y}}=243\) và \(\dfrac{25^x}{5^{x+y}}=125\)
NX
20 tháng 3 2021 lúc 16:09
Giúp mk vớiCâu 1:Cho A dfrac{1}{dfrac{99}{dfrac{1}{2}+}}+dfrac{2}{dfrac{98}{dfrac{1}{3}+}}+dfrac{3}{dfrac{97}{dfrac{1}{4}+....}}+...+dfrac{99}{dfrac{1}{dfrac{1}{100}}}. B dfrac{92}{dfrac{1}{45}+}-dfrac{1}{dfrac{9}{dfrac{1}{50}+}}-dfrac{2}{dfrac{10}{dfrac{1}{55}+}}-dfrac{3}{dfrac{11}{dfrac{1}{60}+....}}-...dfrac{92}{dfrac{100}{dfrac{1}{500}}}. Tính dfrac{A}{B}
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Giúp mk với
Câu 1:
Cho A = \(\dfrac{1}{\dfrac{99}{\dfrac{1}{2}+}}+\dfrac{2}{\dfrac{98}{\dfrac{1}{3}+}}+\dfrac{3}{\dfrac{97}{\dfrac{1}{4}+....}}+...+\dfrac{99}{\dfrac{1}{\dfrac{1}{100}}}\).
B =\(\dfrac{92}{\dfrac{1}{45}+}-\dfrac{1}{\dfrac{9}{\dfrac{1}{50}+}}-\dfrac{2}{\dfrac{10}{\dfrac{1}{55}+}}-\dfrac{3}{\dfrac{11}{\dfrac{1}{60}+....}}-...\dfrac{92}{\dfrac{100}{\dfrac{1}{500}}}\). Tính \(\dfrac{A}{B}\)
DX
31 tháng 3 2021 lúc 13:02
Tìm \(a,b\in Z\) biết \(\dfrac{a}{9}-\dfrac{3}{b}=\dfrac{1}{18}\)
text{Câu 1: Cho các số A và B. Hãy tính tỉ số }dfrac{A}{B} biết:a) Adfrac{4}{7.31}+dfrac{6}{7.41}+dfrac{9}{10.41}+dfrac{7}{10.57}; Bdfrac{7}{19.31}+dfrac{5}{19.43}+dfrac{3}{23.43}+dfrac{11}{23.57}b) Adfrac{1}{2}+dfrac{1}{3}+dfrac{1}{4}+...+dfrac{1}{2021};Bdfrac{2020}{1}+dfrac{2019}{2}+dfrac{2018}{3}+...+dfrac{1}{2020}
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\(\text{Câu 1: Cho các số A và B. Hãy tính tỉ số }\)\(\dfrac{A}{B}\) \(biết:\)
\(a\)) \(A=\dfrac{4}{7.31}+\dfrac{6}{7.41}+\dfrac{9}{10.41}+\dfrac{7}{10.57};\)
\(B=\dfrac{7}{19.31}+\dfrac{5}{19.43}+\dfrac{3}{23.43}+\dfrac{11}{23.57}\)
\(b\)) \(A=\dfrac{1}{2}+\dfrac{1}{3}+\dfrac{1}{4}+...+\dfrac{1}{2021};\)
\(B=\dfrac{2020}{1}+\dfrac{2019}{2}+\dfrac{2018}{3}+...+\dfrac{1}{2020}\)
Tính tỉ số \(\dfrac{A}{B}\) biết \(A=\dfrac{4}{7.31}+\dfrac{6}{7.41}+\dfrac{9}{10.41}+\dfrac{7}{10.57}\) và \(B=\dfrac{7}{19.31}+\dfrac{5}{19.43}+\dfrac{3}{23.43}+\dfrac{11}{23.57}\)
tính a, \(\dfrac{5.4^{15}.9^9-4.30^{20}8^9}{5.2^9.6^{19}-7.2^{29}.27^6}\)
b, 1\(\dfrac{1}{30}\):\(\left(24\dfrac{1}{6}-24\dfrac{1}{5}\right)-\dfrac{1\dfrac{1}{2}-\dfrac{3}{4}}{4x-\dfrac{1}{2}}=\left(-1\dfrac{1}{15}\right):\left(8\dfrac{1}{5}-8\dfrac{1}{3}\right)\)
1. thực hiện phép tính
a. dfrac{11}{21}+dfrac{-4}{7}
b. dfrac{5}{15}+dfrac{14}{25}-dfrac{12}{9}+dfrac{2}{7}+dfrac{11}{25}
c. dfrac{2}{3}+dfrac{5}{7}-dfrac{3}{14}
d. dfrac{2}{5}-dfrac{3}{7}+dfrac{9}{45}
e.dfrac{21}{47}+dfrac{9}{45}+dfrac{26}{47}+dfrac{45}{5}
f. dfrac{15}{12}-dfrac{18}{13}+dfrac{5}{13}-dfrac{3}{12}
g. dfrac{-8}{18}-dfrac{15}{27}
h.dfrac{3}{7}+dfrac{-5}{2}-dfrac{3}{5}
i.(dfrac{11}{12}:dfrac{33}{16}).dfrac{3}{5}
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1. thực hiện phép tính
a. \(\dfrac{11}{21}\)+\(\dfrac{-4}{7}\)
b. \(\dfrac{5}{15}\)+\(\dfrac{14}{25}\)-\(\dfrac{12}{9}\)+\(\dfrac{2}{7}\)+\(\dfrac{11}{25}\)
c. \(\dfrac{2}{3}\)+\(\dfrac{5}{7}\)-\(\dfrac{3}{14}\)
d. \(\dfrac{2}{5}\)-\(\dfrac{3}{7}\)+\(\dfrac{9}{45}\)
e.\(\dfrac{21}{47}\)+\(\dfrac{9}{45}\)+\(\dfrac{26}{47}\)+\(\dfrac{45}{5}\)
f. \(\dfrac{15}{12}\)-\(\dfrac{18}{13}\)+\(\dfrac{5}{13}\)-\(\dfrac{3}{12}\)
g. \(\dfrac{-8}{18}\)-\(\dfrac{15}{27}\)
h.\(\dfrac{3}{7}\)+\(\dfrac{-5}{2}\)-\(\dfrac{3}{5}\)
i.(\(\dfrac{11}{12}\):\(\dfrac{33}{16}\)).\(\dfrac{3}{5}\)