x x 15 = 255
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15 x 5 + 3 x 5 + 5 x 2 - 10 x 5
= 5 x(15 + 3 + 2 - 10)
= 5 x 10
= 50
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 42 x x = 15 792
x = 15792 : 42
x = 376
b, x : 255 = 203
x = 203 x 255
x = 51765
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X x 15 + X x 35 = 150
X x ( 15 + 35 ) = 150
X x 50 = 150
x = 150 : 50
x = 3
vay x =3
k nha
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15 + ( x : 5 - 1 ) = 24
15 + ( x : 5 - 1 ) = 16
x : 5 - 1 = 16 - 15
x : 5 - 1 = 1
x : 5 = 1 + 1
x : 5 = 2
x = 10
Vậy x = 10
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(-\dfrac{3}{4}=\dfrac{x}{12}=\dfrac{-15}{y-1}\)
\(\Rightarrow\left\{{}\begin{matrix}\dfrac{x}{12}=-\dfrac{3}{4}\\\dfrac{-15}{y-1}=-\dfrac{3}{4}\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}x=-\dfrac{3}{4}\cdot12\\y-1=-\dfrac{3}{4}\cdot\left(-15\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}x=-9\\y-1=\dfrac{45}{4}\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x=-9\\y=\dfrac{49}{4}\end{matrix}\right.\)
Ta có
\(\dfrac{-3}{4}=\dfrac{x}{12}\)
\(x=-3\cdot12:4=-9\)
Lại có:
\(-\dfrac{3}{4}=\dfrac{-15}{y}-1\)
\(\dfrac{15}{y}=-\dfrac{1}{4}\)
\(y=-15\cdot4=-60\)
Kết luận \(\left[{}\begin{matrix}x=-9\\y=-60\end{matrix}\right.\)
x * 15 = 255
x = 255 : 15
x = 17
x = 255 : 15
x =17