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\(\left(x+1,2\right)+\left(x+1,5\right)+\left(x+1,8\right)+...+\left(x+5,7\right)=103,2\)
\(\left(x+x+...+x\right)+\left(1,2+1,5+1,8...+5,7\right)=103,2\)
Gọi \(\left(1,2+1,5+1,8....+5,7\right)\) là \(A\)
Xét \(A\) :
1) K/c : \(1,5-1,2=0,3\)
2) SSH :\(\left(5,7-1,2\right):0,3+1=16\) số \(\Rightarrow16\) x
3) Tổng : \(\left(5,7+1,2\right).16:2=55,2\)
\(\Rightarrow\) \(x.16+55,2=103,2\)
\(x.16=103,2-55,2\)
\(x.16=48\)
\(x=48:16\)
\(x=3\)
Kluận: \(x=3\)
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3,4 - x + 1,7 = 1,05
x + 1,7 = 3,4 - 1,05
x + 1,7 = 2,35
x = 2,35 - 1,7
x = 0,65
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a: =>y+1,2=(5,34-10,34):5=-1
=>y=-2,2
b: =>x(x+1)/2=111a
=>x(x+1)=222a
=>\(x\in\varnothing\)
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1,2 : x = 1,7 ( dư 0,01)
x = ( 1,2 - 0,01) : 1,7
x = 1,19 : 1,7
x = 0,7
Đây bạn nha!
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`a,`
\(x\times100=41,87\)
\(\Rightarrow x=41,87\div100\)
$-> x=0,4187$
`b,`
\(0,48\div x=1,2\)
\(\Rightarrow x=0,48\div1,2\)
\(\Rightarrow x=0,4\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)