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\(\dfrac{-28}{35}=\dfrac{16}{x}\\ x=\dfrac{35\cdot16}{-28}=-20\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{-28}{35}=\dfrac{16}{x}\\ \Rightarrow-28\cdot x=35\cdot16=560\\ x=560:-28\\ x=-20\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: =>16/x=-4/5
hay x=-20
b: =>x+7/15=-2/3
=>x+7=-10
hay x=-17
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(\Leftrightarrow\dfrac{16}{x}=\dfrac{-4}{5}\)
hay x=-20
b: =>x+7=-10
hay x=-17
Tìm số nguyên x, biết:
a) \(\dfrac{-28}{35}=\dfrac{16}{x};\) b) \(\dfrac{x+7}{15}=\dfrac{-24}{36}.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a.\)
\(\dfrac{-28}{35}=\dfrac{16}{x}\)
\(\Rightarrow x=\dfrac{35\cdot16}{-28}=\dfrac{5\cdot7\cdot4\cdot4}{-7\cdot4}=-20\)
\(b.\)
\(\dfrac{x+7}{15}=\dfrac{-24}{36}\)
\(\Rightarrow x+7=\dfrac{15\cdot-24}{36}=\dfrac{5\cdot3\cdot-12\cdot2}{12\cdot3}=-10\)
\(\Leftrightarrow x=-17\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(5\cdot x+7\right):2=16\) \(128-3\cdot\left(x-4\right)=23\)
\(\left(5\cdot x+7\right)=16\cdot2\) \(3\cdot\left(x-4\right)=128-23\) \([\left(4\cdot x+28\right)\cdot3+55]:5=35\)
\(\left(5\cdot x+7\right)=32\) \(3\cdot\left(x-4\right)=105\) \([\left(4\cdot x+28\right)\cdot3+55]=35\cdot5\)
\(5\cdot x=32-7\) \(x-4=105:3\) \([\left(4\cdot x+28\right)\cdot3+55]=175\)
\(5\cdot x=25\) \(x-4=35\) \(\left(4\cdot x+28\right)\cdot3=175-55\)
\(x=25:5\) \(x=35+4\) \(\left(4\cdot x+28\right)\cdot3=120\)
\(x=5\) \(x=39\) \(\left(4\cdot x+28\right)=120:3\)
\((4\cdot x+28)=40\)
\(4\cdot x=40-28\)
\(4\cdot x=12\)
\(x=12:4\)
\(x=3\)
Chúc bạn hok tốt !
a) 5x X+7=16x2 b)3x(X-4)=128-23 c)(4x X +28 ) x 3 + 55 = 35 x 5
5xX+7=32 3x(X-4)=105 (4x X + 28) x3 +55 =175
5xX=32-7 X-4 = 105 : 3 (4x X + 28 ) x3 = 175 -55
5xX=25 X-4 = 35 (4x X + 28 ) x3 = 120
X=25:5 X = 35 + 4 4x X + 28 = 120 : 3=40
X=5 X = 39 X = (40-28):4=3
![](https://rs.olm.vn/images/avt/0.png?1311)
a.70 -5.(x-3)=45
x-3=70-5-45
x-3=20
x=20-3=17
b.2x-138=8.9
2x-138=72
2x=72+138
2x=210
x=210:2=105
c.10+2n=16
2n=16-10
2n=6
n=6:3=2
d.[(4x+28).3+55]:5=35
[(4x+28).3+55]=35x5=175
4x+28=(175-55):3
4x+28=40
4x=40-28=12
x=12:4=3
Dung thi k mk nha
Chuc bn hoc gioi nha
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1.
\(35\times\left(14-23\right)-23\times\left(14-35\right)\)
\(=35\times14-35\times23-23\times14+23\times35\)
\(=\left(23\times35-35\times23\right)+14\times\left(35-23\right)\)
\(=0+14\times12\)
\(=168\)
2.
\(27\times\left(13-16\right)-16\times\left(13-27\right)\)
\(=27\times13-27\times16-16\times13+16\times27\)
\(=13\times\left(27-16\right)+\left(27\times16-16\times27\right)\)
\(=13\times11+0\)
\(=143\)
3.
\(44\times\left(-36\right)+22\times\left(-28\right)\)
\(=22\times2\times\left(-36\right)+22\times\left(-28\right)\)
\(=22\times\left(-72\right)+22\times\left(-28\right)\)
\(=22\times\left[\left(-72\right)+\left(-28\right)\right]\)
\(=22\times\left(-100\right)\)
\(=-2200\)
Chúc bạn học tốt
\(\dfrac{16}{x}=\dfrac{-28}{35}\)
\(x=\dfrac{16\cdot35}{\left(-28\right)}\)
\(x=\dfrac{560}{\left(-28\right)}\)
\(x=-20\)