8 x X - X = 2156.Giai cả ra hộ mk vs nhé
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X : 15/57 + X = 3/8
X x 57/15 + X = 3/8
X x ( 57/15 + 1 ) = 3/8
X x 24/5 = 3/8
X = 3/8 : 24/5
X = 5/64
ttvv :3
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\(\frac{12}{7}\times\frac{2}{11}+\frac{12}{11}\times\frac{15}{7}-\frac{12}{7}\times\frac{6}{11}\)
\(=\frac{12}{7}\times\frac{2}{11}+\frac{12}{7}\times\frac{15}{11}-\frac{12}{7}\times\frac{6}{11}\)
\(=\frac{12}{7}\times\left(\frac{2}{11}+\frac{15}{11}-\frac{6}{11}\right)\)
\(=\frac{12}{7}\times1=\frac{12}{7}\)
\(\frac{12}{7}.\frac{2}{11}+\frac{12}{11}.\frac{15}{7}-\frac{12}{7}.\frac{6}{11}\)
= \(\frac{24}{77}\)+\(\frac{180}{77}\)-\(\frac{72}{77}\)
=\(\frac{132}{77}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
5*x-x=29-6^2/2^2
5*x-x=29-36/4
5*x-x=29-9
5*x-x=20
(5-1)x=20
4x=20
x=5
5x - x = 29 - 6^2/2^2
5x - x = 29 - 36/4
5x - x = 29 - 9
5x - x = 20
=> x = 5
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài này có 2 trường hợp:
TH1: x-1 = 0 suy ra x = 1
TH2: x+2 = 0 suy ra x = -2
Vậy x = 1 hoặc -2
Nhớ k cho mình nhé!
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\(N=\left|x+3\right|+\left|x+4\right|+\left|x+5\right|\)
\(\left|x+3\right|,\left|x+4\right|,\left|x+5\right|\ge0\)
\(\Rightarrow N\ge0\)
\(N=\left(x+3\right)+\left(x+4\right)+\left(x+5\right)\ge0\)
\(N=\left(x+x+x\right)+\left(3+4+5\right)\)
\(N=3x+12\)
\(\Rightarrow N=3x\ge12\)
\(\Rightarrow N=x\ge4\)
\(\Rightarrow N\ge4\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\sqrt{4x-8}-\sqrt{x-2}=2.\)
ĐK \(x\ge2\)
PT<=> \(2\sqrt{x-2}-\sqrt{x-2}=2\)
<=> \(\sqrt{x-2}=2\)
<=> x-2=4
<=> x=6 (t/m)
Vậ pt có nghiệm x=6
<=>7xX=2156=>X=2156:7=308
8xX-X=2156
(8-1)xX=2156
7xX=2156
X=2156:7
X=308