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15 * x - x =378
15 * x - x * 1 = 378
x * ( 15 - 1 ) = 378
x * 14 = 37
x = 378 : 14
x = 27
![](https://rs.olm.vn/images/avt/0.png?1311)
15 * x - x = 378
15 * x - x * 1 = 378
( 15 - 1 ) * x = 378
14 * x = 378
x = 378 : 14
x = 27
![](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)
15 * x - x = 378
15 * x - x * 1 = 378
( 15 - 1 ) * x = 378
14 * x = 378
x = 378 : 14
x = 27
tk nha
![](https://rs.olm.vn/images/avt/0.png?1311)
378 x 46 + 189 x 72 - 4 x 78 x 25
= 17388 + 13608 - ( 4 x 25 ) x 78
= 17388 + 13608 - ( 100 x 78 )
= 17388 + 13608 - 7800
= ( 17388 - 7800 ) + 13608
= 9588 + 13608
= 23196
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
x:10=378+65
x:10=443
x=443×10
x=4430
Vậy đáp án đúng điền vào ô trống là 4430.
![](https://rs.olm.vn/images/avt/0.png?1311)
15*x-x=378
15*x-1*x=378
(15-1)*x=378
14*x=378
x=378:14
x=27
Nhớ t*** nha!
\(x^2-2x=378\Rightarrow x^2-2x-378=0\Rightarrow x^2-2x+1-377=0\Rightarrow\left(x-1\right)^2-377=0\Rightarrow\left(x-1-\sqrt{377}\right)\left(x-1+\sqrt{377}\right)=0\Rightarrow\left[{}\begin{matrix}x=1+\sqrt{377}\\x=1-\sqrt{377}\end{matrix}\right.\)