15*x-x=378

14*x=378

      x=378:14

      x=27

15*x-x=378

x*(15-1)=378

x*14 = 378

x= 378/14=27

15 * x - x      =378 

 15 * x - x * 1 = 378

 x * ( 15 - 1 )  = 378

 x * 14           = 37

 x                   = 378 : 14

x                      = 27

=>14*x=378

=>x=378:14

=>x=27

tk cho mik nhé

15x-x=378

14x=378

x=378/14

x=27

Vậy x=27

X x 15 - X = 378

X x 15 - X x 1 = 378

X x ( 15 - 1 ) = 378

X x     14       = 378

            X        = 378 : 14

            X         =     27

15 * x - x = 378

15 * x - x * 1   = 378

 ( 15 - 1 ) * x = 378

14 * x = 378

x = 378 : 14

x = 27

tk nha

15xX-X=378

14xX=378

x=378:14

x=27

xX(15-1)=378

xX14=378

x=378:14

x=27

\(15\times x-x=378\)

\(\Leftrightarrow15\times x-x\times1=378\)

\(\Rightarrow\left(15-1\right)\times x=378\)

\(\Rightarrow14\times x=378\)

\(\Rightarrow x=378:14\)

\(\Rightarrow x=27\)

Vậy x = 27

15*x-x=378

15*x-1*x=378

(15-1)*x=378

14*x=378

x=378:14

x=27

Nhớ t*** nha!

15x - x = 378

  14x    = 378

    x      = 378 : 14

    x      = 27

15 * x - x = 378

= 15x - x = 378

= 14 * x = 378

x = 378 : 14

x = 27

15*x-x=378

14*x=378

x=378:14

x=27

1875+1997+(1825-1497)

=1875+1825+1997-1497

=2700+1500

=4200

378 x 64+189 x132

= (378+132)x (64+189)

=500 x (53+200)

=500 x53 +500 x 200

=26500+100000

126500

Ta có: \(378\times46+189\times72-4\times78\times25\)

\(=378\times46+378\times36-100\times78\)

=378x(46+36)-7800

=378x82-7800

=30996-7800

=23196