Rút gọn phân số sau
a.5/25;75/100;64/720;16/1000 b.4/6;12/8;15/25;11/22 c.5/10;12/36;9/72;75/300 d.14/28;25/50;48/30;81/54.
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a) \(\dfrac{7}{56}=\dfrac{7:7}{56:7}=\dfrac{1}{8}\)
b) \(\dfrac{25}{100}=\dfrac{25:25}{100:25}=\dfrac{1}{4}\)
a \(\dfrac{-2}{5}\)
b -1
c \(\dfrac{2}{5}\)
d \(\dfrac{-18}{11}\)
Bài 1:
a: =-3/7
b: =-3/5
c: =1/13
d: =-1/2
Bài 2:
a: \(=\dfrac{21\cdot11}{22\cdot9}=\dfrac{1}{2}\cdot\dfrac{7}{3}=\dfrac{7}{6}\)
b: \(=\dfrac{49\cdot8}{10}=\dfrac{196}{5}\)
a: \(A=\dfrac{2\cdot8^4\cdot27^2+44\cdot6^9}{2^7\cdot6^7+2^7\cdot40\cdot9^4}\)
\(=\dfrac{2\cdot2^{12}\cdot3^6+2^2\cdot11\cdot2^9\cdot3^9}{2^7\cdot3^7\cdot2^7+2^7\cdot2^3\cdot5\cdot3^8}\)
\(=\dfrac{2^{13}\cdot3^6+2^{11}\cdot3^9\cdot11}{2^{14}\cdot3^7+2^{10}\cdot5\cdot3^8}\)
\(=\dfrac{2^{11}\cdot3^6\left(2^2+3^3\cdot11\right)}{2^{10}\cdot3^7\left(2^4+5\cdot3\right)}\)
\(=\dfrac{2\cdot301}{3\cdot31}=\dfrac{602}{93}\)
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Câu hỏi của hoang van binh - Toán lớp 4 - Học trực tuyến OLM
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Câu hỏi của hoang van binh - Toán lớp 4 - Học trực tuyến OLM
\(A=\left(\dfrac{15-\sqrt{x}}{x-25}+\dfrac{2}{\sqrt{x}+5}\right):\dfrac{\sqrt{x}+1}{\sqrt{x}-5}\)
\(=\dfrac{15-\sqrt{x}+2\sqrt{x}-10}{\left(\sqrt{x}+5\right)\left(\sqrt{x}-5\right)}\cdot\dfrac{\sqrt{x}-5}{\sqrt{x}+1}\)
\(=\dfrac{1}{\sqrt{x}+1}\)
\(A=\left(\dfrac{15-\sqrt{x}}{x-25}+\dfrac{2}{\sqrt{x}+5}\right):\dfrac{\sqrt{x}+1}{\sqrt{x}-5}\left(x\ge0;x\ne25\right)\\ A=\dfrac{15-\sqrt{x}+2\left(\sqrt{x}-5\right)}{\left(\sqrt{x}-5\right)\left(\sqrt{x}+5\right)}\cdot\dfrac{\sqrt{x}-5}{\sqrt{x}+1}\\ A=\dfrac{5+\sqrt{x}}{\sqrt{x}+5}\cdot\dfrac{1}{\sqrt{x}+1}=\dfrac{1}{\sqrt{x}+1}\)
a)\(\dfrac{5}{25}=\dfrac{1}{5}\)
\(\dfrac{75}{100}=\dfrac{3}{4}\)
\(\dfrac{64}{720}=\dfrac{4}{45}\)
\(\dfrac{16}{1000}=\dfrac{2}{125}\)
b)\(\dfrac{4}{6}=\dfrac{2}{3}\)
\(\dfrac{12}{8}=\dfrac{3}{2}\)
\(\dfrac{15}{25}=\dfrac{3}{5}\)
\(\dfrac{11}{22}=\dfrac{1}{2}\)
c)\(\dfrac{5}{10}=\dfrac{1}{2}\)
\(\dfrac{12}{36}=\dfrac{1}{3}\)
\(\dfrac{9}{72}=\dfrac{1}{8}\)
\(\dfrac{75}{300}=\dfrac{1}{4}\)
d)\(\dfrac{14}{28}=\dfrac{1}{2}\)
\(\dfrac{25}{50}=\dfrac{1}{2}\)
\(\dfrac{48}{30}=\dfrac{8}{5}\)
\(\dfrac{81}{54}=\dfrac{3}{2}\)
a: 5/25=1/5
75/100=3/4
64/720=4/45
16/1000=2/125
b: 4/6=2/3
12/8=3/2
15/25=3/5
11/22=1/2
c: 5/10=1/2
12/36=1/3
9/72=1/8
75/300=1/4
d: 14/28=1/2
25/50=1/2
48/30=8/5
81/54=3/2