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\(92.4-27=\frac{a+350}{a}+315\)
\(368-27=\frac{a+350}{a}+315\)
\(368-27=1+\frac{350}{a}+315\)
\(341=\frac{350}{a}+316\)
\(341-316=\frac{350}{a}\)
\(25=\frac{350}{a}\)
\(25a=350\)
\(a=350:25\)
\(a=14\)
\(92.4-27=\frac{a+350}{a}+315\)
\(\Rightarrow368-27=1+\frac{350}{a}+315\)
\(\Rightarrow341-1-315=\frac{350}{a}\)
\(\Rightarrow25=\frac{350}{a}\)
\(\Rightarrow a=\frac{350}{25}=14\)
![](https://rs.olm.vn/images/avt/0.png?1311)
b, 92 : 4 - 27 = \(\dfrac{x+350}{x}\) + 315
23 - 27 = 1 + \(\dfrac{350}{x}\) + 315
316 + \(\dfrac{350}{x}\) = -4
\(\dfrac{350}{x}\) = - 316 - 4
\(\dfrac{350}{x}\) = -320
-320 \(x\) = 350
\(x\) = 350: (-320)
\(x\) = - \(\dfrac{35}{32}\) (loại)
Vậy \(x\) \(\in\) \(\varnothing\)
c, 720 : [ 41 - (2\(x\) - 5)] = 23.5
41 - (2\(x\) - 5) = 720 : (23.5)
41 - 2\(x\) + 5 = 18
46 - 2\(x\) =18
2\(x\) = 46 - 18
2\(x\) = 28
\(x\) = 28: 2
\(x\) = 14
Vậy \(x\) = 14
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Lời giải là
92.4−27=a+350a+315
368−27=a+350a+315
341=a+350a+315
a+350a=341−315
a+350a=26
a+350=26.a
26.a−a=350
(26−1).a=350
25.a=350
a=350:25
a=14.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
92X4-27=\(\dfrac{a+350}{a}\)+315
=>341=1+\(\dfrac{350}{a}\)+315=316+\(\dfrac{350}{a}\)
=>\(\dfrac{350}{a}\)=341-316=25
=>a=\(\dfrac{350}{25}\)=14
![](https://rs.olm.vn/images/avt/0.png?1311)