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\(=\left(100+900\right)+\left(800+200\right)+...+\left(900+100\right)\)(9 cặp)
\(=1000+1000+...+1000\)(9 số 1000)
\(=1000\times9\)
\(=9000\)
k mình nha
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100+50:2+75+200:2+400:2+500
= 100 + 25 + 75 + 100 + 200 + 500
= 100 + 100 + 100 + 200 + 500
= 500 + 500
= 1000
100 + 50 : 2 + 75 + 200 : 2 + 400 : 2 + 500
= 100 + 25 + 75 + 100 + 200 + 500
= 125 + 75 + 100 + 200 + 500
= 200 + 100 + 200 + 500
= 300 + 200 + 500
= 500 + 500
= 1000
![](https://rs.olm.vn/images/avt/0.png?1311)
1)x+100=200-500
x+100=-300
x=-300-100
x=-400
2)x-100=200-500
x-100=-300
x=-300+100
x=-200
![](https://rs.olm.vn/images/avt/0.png?1311)
x - 100 = 200 + 900
x - 100 = 1100
x = 1100 + 100
x = 1200
x + 100 = 300 - 400
x + 100 = - 100
x = - 100 - 100
x = - 200
x+100=200+900
x+100=1000
x=1000-100
x=900
x+100=300-400
x+100=-100
x=-100-100
x=-200
![](https://rs.olm.vn/images/avt/0.png?1311)
a, Có: \(25^{200}=\left(5^2\right)^{200}=5^{400}\)
Vì \(5^{400}=5^{400}\) mà \(25^{200}=5^{400}\Rightarrow5^{400}=25^{200}\)
c, Có:
a/ 263 và 342
Ta có: 263=(23)21=821
342=(32)21=921
mà 821<921
vậy 263<342
b/5400 và 25200
Ta có: 25200=(52)200=5400
mà 5400=5400
vậy 5400=25200
c/ \(\left(\dfrac{-1}{16}\right)^{100}v\text{à}\left(\dfrac{-1}{2}\right)^{500}\)
Ta có: \(\left(\dfrac{-1}{2}\right)^{500}=\left(\left(\dfrac{-1}{2}\right)^5\right)^{100}=\left(\dfrac{-1}{32}\right)^{100}\)
mà: \(\left(\dfrac{-1}{16}\right)^{100}< \left(\dfrac{-1}{32}\right)^{100}\)
vậy\(\left(\dfrac{-1}{16}\right)^{100}< \left(\dfrac{-1}{2}\right)^{500}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
x +400=1000-200
x+400=800
x=800-400
x=400
mình nha, mik bạn rùi
x + 200 = 500 - 400
x + 200 = 100
x = 100 - 200
x = -100
x + 200 = 500 - 400
x + 200 = 100
x = 100 - 200
x = - 100