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a) Ta có: \( - 2 = \frac{{ - 2}}{1} = \frac{{ - 40}}{{20}}\)
\(\frac{{ - 11}}{5} = \frac{{ - 44}}{{20}} < \frac{{ - 40}}{{20}}\) nên \(\frac{{ - 11}}{5} < -2\).
\(\frac{{ - 7}}{4} = \frac{{ - 7.5}}{{4.5}} = \frac{{ - 35}}{{20}} > \frac{{ - 40}}{{20}}\) nên \(\frac{{ - 7}}{4} > -2\)
Vậy \(\frac{{ - 11}}{5} < \frac{{ - 7}}{4}\).
b) Ta có: \(\frac{{2020}}{{ - 2021}} = \frac{{ - 2020}}{{2021}} > \frac{{ - 2022}}{{2021}}\)
Vậy \(\frac{{2020}}{{ - 2021}} > \frac{{ - 2022}}{{2021}}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
3.(x-2)+150=240
=>3.(x-2)=90
=>x-2=30
=>x=32
360:(x-7)=90
=>x-7=4
=>x=11
Cau cuối mình không hiểu đề cho lắm
![](https://rs.olm.vn/images/avt/0.png?1311)
Tìm x thuộc N biết:
X+245=43×11
=>x+245=473
=>x=228
X-382=159:3
=>x-382=53
=>x=53+382=438
7×X+2×X=918
=>(7+2).x=918
=>9x=918
=>x=918:9=102
3×(X-2)+150=240
=>3.(x-2)=240-150
=>3.(x-2)=90
=>x-2=90:3=30
=>x=30+2=32
(X+13):5=12
=>(x+13)=12.5
=>x+13=60
=>x=60-13
=>x=47
Bấm **** nha
360:(X-7)=90
X+245=43*11
X+245=473
x=473-245
X=228
X-382=159:3
X-382=53
X=382+53
X=435
7*X+2*X=918
(7+2)*X=918
9*X=918
X=918:9
X=102
3*(X-2)+150=240
3*(X-2)=240-150
3*(X-2)=90
X-2=90:3
X-2=30
X=30-2
X=28
(X+13):5=12
X+13=12*5
X+13=60
X=60-13
X=47
360:(X-7)=90
X-7=360:90
X-7=4
X=7+4
X=11
![](https://rs.olm.vn/images/avt/0.png?1311)
\(5^{91}>5^{90}=\left(5^3\right)^{30}=125^{30}\)
\(11^{59}< 11^{60}=\left(11^2\right)^{30}=121^{30}\)
Mà \(11^{59}< 121^{30}< 125^{30}< 5^{91}\Rightarrow11^{59}< 5^{91}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) (-13).5 < 0
b) 200 > 200 . (-3)
c) (-17) . 2 < -17
d) (-11) . 8 < -11.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(M=5.\left(\frac{1}{11}+\frac{1}{12}+\frac{1}{13}+\frac{1}{14}\right)\)
Vì \(\frac{1}{11}+\frac{1}{12}+\frac{1}{13}+\frac{1}{14}\ne0\)
\(\Rightarrow5.\left(\frac{1}{11}+\frac{1}{12}+\frac{1}{13}+\frac{1}{14}\right)>5\)
mà \(5>2\)
\(\Rightarrow M>2\)
ta có 5/12<5/11
5/13<5/11
5/14<5/11
suy ra 5/12+5/13+5/14<5/11+5/11+5/11
hay 5/11+5/12+5/13+5/14<5/11+5/11+5/11+5/11
hay M<20/11<2
vậy M<2
mink đi thi toán thành phố rùi tin mink đi