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\(\dfrac{-63}{72}=\dfrac{-7}{8}\)
\(\dfrac{20}{-140}=\dfrac{-1}{7}\)
\(\dfrac{3.10}{5.24}=\dfrac{30}{120}=\dfrac{1}{4}\)
\(\dfrac{3.7.11}{22.9}=\dfrac{231}{198}=\dfrac{7}{6}\)
\(\dfrac{8.5-8.2}{16}=\dfrac{24}{16}=\dfrac{3}{2}\)
\(\dfrac{11.4-11}{2-13}=\dfrac{33}{-11}=-3\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,\frac{22}{55}=\frac{2}{5}\)
\(b,\frac{20}{-140}=\frac{-1}{7}\)
k mk nha thanks nhiều
Mọi người ủng hộ mk nhé
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Bài 1:
a) \(a=2\cdot3\cdot5\cdot43\)
\(b=7200=2^5\cdot3^2\cdot5^2\)
\(c-4680=2^3\cdot3^2\cdot5\cdot13\)
b) \(\dfrac{8440}{5910}=\dfrac{8440:10}{5910:10}=\dfrac{844}{591}\)
\(\dfrac{1245}{3450}=\dfrac{1245:15}{3450:15}=\dfrac{83}{230}\)
Bài 2:
a) Ước nguyên tố của 140 là:
\(ƯNT\left(140\right)=\left\{2;5;7\right\}\)
Ước nguyên tố của 138 là:
\(ƯNT\left(138\right)=\left\{3;23;2\right\}\)
b) \(A=\dfrac{2^{10}+4^6}{8^4}\)
\(A=\dfrac{2^{10}+2^{12}}{2^{12}}\)
\(A=\dfrac{2^{10}\cdot\left(1+2^2\right)}{2^{12}}\)
\(A=\dfrac{1+4}{2^2}\)
\(A=\dfrac{5}{4}\)
\(B=\dfrac{6^{10}+15\cdot2^{10}\cdot3^9}{12\cdot8^3\cdot27^3}\)
\(B=\dfrac{2^{10}\cdot3^{10}+5\cdot2^{10}\cdot3^{10}}{2^{11}\cdot3^{10}}\)
\(B=\dfrac{2^{10}\cdot3^{10}\cdot\left(1+5\right)}{2^{11}\cdot3^{10}}\)
\(B=\dfrac{1+5}{2}\)
\(B=3\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\dfrac{8,5-8,2}{16}=\dfrac{0,3}{16}=\dfrac{0,3\cdot10}{16\cdot10}=\dfrac{3}{160}\)
b) \(\dfrac{17\cdot5-17}{3-20}=\dfrac{17\cdot\left(5-1\right)}{-17}=\dfrac{1\cdot4}{-1}=-4\)
a)
\(\dfrac{8\cdot5-8\cdot2}{16}=\dfrac{8\left(5-2\right)}{16}=\dfrac{3}{2}\)
b)
\(\dfrac{17\cdot5-17}{3-20}=\dfrac{17\left(5-1\right)}{-17}=\dfrac{4}{-1}=-4\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{17.5-17}{3-20}=\frac{17\left(5-1\right)}{-17}\frac{17.4}{-17}=\frac{4}{-1}=-4\)
![](https://rs.olm.vn/images/avt/0.png?1311)
20/45 = 4/9
14/35 = 2/7
-32/44 = -8/11
Chúc bạn học tốt !!! :)))
Đáp án :
\(\frac{20}{45}=\frac{20:5}{45:5}=\frac{4}{9}\)
\(\frac{14}{35}=\frac{14:7}{35:7}=\frac{2}{5}\)
\(\frac{-32}{44}=\frac{-32:4}{44:4}=\frac{-8}{11}\)
Hok tốt
Hướng dẫn: Chia cả tử và mẫu cho UCLN của chúng:
ƯCLN(20, -140 ) = 20. Do đó: