(0,8)^5:(0,4)^6
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(\dfrac{11}{4}\right)^{12}:\left(-\dfrac{11}{4}\right)^{11}\)
\(=\left(-\dfrac{11}{4}\right)^{12}:\left(-\dfrac{11}{4}\right)^{11}\)
\(=\left(-\dfrac{11}{4}\right)^{12-11}\)
\(=\left(-\dfrac{11}{4}\right)^1\)
\(=-\dfrac{11}{4}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(\dfrac{3}{7}\right)^2.\left(-7\right)^4\\ =\left(\dfrac{3}{7}\right)^2.7^4\\ =\left(\dfrac{3}{7}\right)^2.7^2.7^2\\ =9.49\\ =441\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Vì \(\dfrac{1}{11}>\dfrac{1}{18}>\dfrac{1}{21}>\dfrac{1}{24}>\dfrac{1}{27}>\dfrac{1}{29}\)
\(\Rightarrow\dfrac{1}{11}+\dfrac{1}{11}+\dfrac{1}{11}+\dfrac{1}{11}+\dfrac{1}{11}+\dfrac{1}{11}+\dfrac{1}{11}>\dfrac{1}{4}+\dfrac{1}{11}+\dfrac{1}{18}+\dfrac{1}{21}+\dfrac{1}{24}+\dfrac{1}{27}+\dfrac{1}{29}\)\(\dfrac{1}{11}+\dfrac{1}{11}+\dfrac{1}{11}+\dfrac{1}{11}+\dfrac{1}{11}+\dfrac{1}{11}+\dfrac{1}{11}=\dfrac{1}{11}.7=\dfrac{7}{11}\)
Ta có:
\(\dfrac{7}{11}=\dfrac{7.5}{11.5}=\dfrac{35}{55};\dfrac{4}{5}=\dfrac{4.11}{5.11}=\dfrac{44}{55}\)
\(Vì\) \(\dfrac{44}{55}>\dfrac{35}{55}\)
\(\Rightarrow\dfrac{4}{5}>\dfrac{7}{11}\)
\(\Rightarrow\dfrac{1}{4}+\dfrac{1}{11}+\dfrac{1}{18}+\dfrac{1}{21}+\dfrac{1}{24}+\dfrac{1}{27}+\dfrac{1}{29}< \dfrac{4}{5}\left(đpcm\right)\)
Ta thấy :
\(\dfrac{1}{4}+\dfrac{1}{11}< \dfrac{1}{4}+\dfrac{1}{4}=\dfrac{1}{2}=1-\dfrac{1}{2}\)
\(\dfrac{1}{18}+\dfrac{1}{21}< \dfrac{1}{12}+\dfrac{1}{12}=\dfrac{1}{6}=\dfrac{1}{2}-\dfrac{1}{3}\)
\(\dfrac{1}{24}+\dfrac{1}{27}< \dfrac{1}{24}+\dfrac{1}{24}=\dfrac{1}{12}=\dfrac{1}{3}-\dfrac{1}{4}\)
\(\dfrac{1}{29}< \dfrac{1}{20}=\dfrac{1}{4}-\dfrac{1}{5}\)
\(\Rightarrow\dfrac{1}{4}+\dfrac{1}{11}+\dfrac{1}{18}+\dfrac{1}{21}+\dfrac{1}{24}+\dfrac{1}{27}+\dfrac{1}{29}< 1-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{4}+\dfrac{1}{4}-\dfrac{1}{5}\)
\(\Rightarrow\dfrac{1}{4}+\dfrac{1}{11}+\dfrac{1}{18}+\dfrac{1}{21}+\dfrac{1}{24}+\dfrac{1}{27}+\dfrac{1}{29}< 1-\dfrac{1}{5}=\dfrac{4}{5}\)
\(\Rightarrow dpcm\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 4
4a, 12,48 x 3,47 - 3,47 x 2,48
= 3,47 x ( 12,48 - 2,48)
= 3,47 x 10
= 34,7
4b, 128 x 68 + 16 x 256
= 128 x 68 + 16 x 2 x 128
= 128 x (68 + 32)
= 128 x 100
12800
4c, (7,29 + 9,34 + 8,27) - (7,34 + 6,27 + 5,29)
= 7,29 + 9,34 + 8,27 - 7,34 - 6,27 - 5,29
= (7,29 - 5,29) + (9,34 - 7,34) + (8,27 - 6,27)
= 2 + 2 + 2
= 6
![](https://rs.olm.vn/images/avt/0.png?1311)
2a,
(100 + 67) x 67 + (200 - 33) x 33
= 167 x 67 + 167 x 33
= 167 x (67 + 33)
= 167 x 100
= 16700
2b, 45,651 x 73 + 45,651 x 20 + 45,651 x 7
= 45,651 x (73 + 20 + 7)
= 45,651 x 100
= 4565,1
![](https://rs.olm.vn/images/avt/0.png?1311)
D = 3\(\dfrac{1}{2}\) \(\times\) \(\dfrac{12}{43}\) + \(\dfrac{49}{14}\) \(\times\) \(\dfrac{31}{43}\) + \(\dfrac{11}{2}\)
D = \(\dfrac{7}{2}\) \(\times\) \(\dfrac{12}{43}\) + \(\dfrac{7}{2}\) \(\times\) \(\dfrac{31}{43}\) + \(\dfrac{11}{2}\)
D = \(\dfrac{7}{2\times43}\) \(\times\) (12 + 31) + \(\dfrac{11}{2}\)
D = \(\dfrac{7}{2\times43}\) \(\times\) 43 + \(\dfrac{11}{2}\)
D = \(\dfrac{7}{2}\) + \(\dfrac{11}{2}\)
D = 9
D = 3 và 1/2 x 12/43 + 49/14 x 31/43 + 11/2
= 7/2 x 12/43 + 49/14 x 31/43 + 11/2
= 42/43 + 217/36 + 11/2
=9
# https://lazi.vn/user/tnsociu
![](https://rs.olm.vn/images/avt/0.png?1311)
1a, 6,28 x 18,24 + 18,24 x 3,72
= 18,24 x (6,28 + 3,72)
= 18,24 x 10
= 182,4
b, 35,7 x 99 + 35 + 0,7
= 35,7 x 99 + 35,7
= 35,7 x (99 + 1)
= 35,7 x 100
= 3570
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\Rightarrow\) The bigger an apartment is, the higher its rent is
#Wendy Dang
Mik sửa vế 2 nhé :
\(\Rightarrow\) The bigger an apartment is, the higher the rent is
![](https://rs.olm.vn/images/avt/0.png?1311)
\(111+999=1110\)
\(222+333=555\)
\(406+903=1309\)
\(102+870=972\)
\(784+655=1439\)
\(232+980=1212\)
#Wendy Dang
(0,8)⁵ : (0,4)⁶
= (4/5)⁵ : (2/5)⁶
= 1024/3125 : 64/15625
= 16 . 5
= 80
\(\left(0,8\right)^5:\left(0,4\right)^6\\ =\left(\dfrac{4}{5}\right)^5:\left(\dfrac{2}{5}\right)^6\\ =\dfrac{1024}{3125}:\dfrac{64}{15625}\\ =16.5\\ =80\)