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\(27^{11}>81^8;625^5< 125^7;5^{36}>11^{24};5^{28}< 26^{14}\)
Hok tốt
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Độ dài quãng đường AB dài là:
Thời gian người ấy đi xe máy đi từ B về A là:
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48.(23-51)+51.(48-23)
= 48.23-48.51+51.48-51.23
= 48.23-51.23
= 23.(48-51)
= 23.(-3)
= (-69)
1239-239.(-5)-5.239
= 1239.((-5)-5).239
= 1239.-10.239
= -2961210
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\(9+10+11+...+x=1239\)
\(\Leftrightarrow\frac{\left(9+x\right)\left(x-9+1\right)}{2}=1239\)
\(\Leftrightarrow\left(x+9\right)\left(x-8\right)=1239\times2\)
\(\Leftrightarrow x^2+x-72=2478\)
\(\Leftrightarrow\left(x+1\right)x=2478+72\)
\(\Leftrightarrow\left(x+1\right)x=2550=50\cdot51\)
\(\Rightarrow x=50\)
![](https://rs.olm.vn/images/avt/0.png?1311)
156+1239 chia hết cho 3
132-104 không chia hết cho 3
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a: 43/52>26/52=1/2=60/120
b: 17/68=1/4<1/3=35/105<35/103
c: \(\dfrac{2018\cdot2019-1}{2018\cdot2019}=1-\dfrac{1}{2018\cdot2019}\)
\(\dfrac{2019\cdot2020-1}{2019\cdot2020}=1-\dfrac{1}{2019\cdot2020}\)
2018*2019<2019*2020
=>-1/2018*2019<-1/2019*2020
=>\(\dfrac{2018\cdot2019-1}{2018\cdot2019}< \dfrac{2019\cdot2020-1}{2019\cdot2020}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 7 x = 0 x 19 = 0
x = 0 : 7
x = 0
b) 4 x= 1239-7 =1232
= 308
ai k mk mk sẽ k lại cho ^^
2614 > 1239