x+56=78

x=78-56

x=22

x+56=78

x=78-56

x=22

x+56=78

x=78—56

x=22

\(x+48=78\)

\(x=78-48\)

\(x=30\)

t i c k mình nha

x + 48 = 78

x = 78 - 48

x = 30

Vậy x = 30

x=78-48

x=30

\(\Leftrightarrow Xx80=50x80\)

\(\Leftrightarrow X=50\)

#quankun^^

\(78.x+x+x=80.50\)

\(78x+2x=4000\)

\(80x=4000\)

\(x=50\)

\(78\times x+x+x=80\times50\)
\(x\times\left(78+1+1\right)=80\times50\)
\(80\times x=80\times50 \)
\(x=50\)

a) 2 x 12 x 43 + 3 x 32 x 8 + 25 x 6 x4

=(2 x12) x43+(3 x8) x32+(6 x4) x25

=24 x43+24 x32+ 24 x25

=24 x(43+32+25)

=24 x100

=2400

b) 78 x 31 + 78 x 24 + 17 x 78 + 28 x 78

=78x(31+24+17+28)

=78x100

=7800

thanks bạn nha

78 x 31 + 78 x 24 + 17 x 78 +28 x 78 = 78 x ( 31 + 24 + 17 +28 ) =78 x 100 =7800 mình chỉ biết làm phần B thôi thông cảm cho mình nha

x=900-600

x=300

mik nnhanh nhất ha

x= 900-600

x=300

\(x+600=900\)

\(x=900-600\)

\(x=300\)

Vậy x=300

X + 3450 = 6789

X               = 6789 - 3450

X               = 3339

X=6789-3450=3339

x= 6789-3450

x = 3339

K mik đi mik k bạn

567×897+564×34:78-65

=508599+19176:78-65

=508599+3196/13-65

=508844,8462-65

=508779,8462

78x31+78x24+78x17+22x72

=>78x(31+24+17)+22x72

=>78x72+22x72

=>72x(78+22)

=>72x100

=>7200

t nha

12 . 53 + 53 . 16 + 28 . 47

= 53 . ( 12 + 16 ) + 28 . 47

= 53 . 28 + 28 .47

= ( 53 + 47 ) . 48

= 100 . 48

= 4800

78 . 31 . 78 . 24 + 78 . 17 + 22 . 72

= 78 . ( 31 + 24 + 17 ) + 22 . 72

= 78 . 72 + 22 . 72

= ( 78 + 22 ) . 72

= 100 . 72

= 7200

32 x 125 x 3

= 8 . 4 + 125 . 3

= ( 125 . 8 ) . ( 4 . 3 )

= 1000 . 12

= 12000

=53x(12+16)+28x47

=53x28+28x47

=28x(53+47)

=28x100

=2800

=78x(31+24+17)+22x72

=78x72+22x72

=72x(78+22)

=72x100

=7200

=4000x3

=12000

Mk ko viết lại đề bn ak!