mình k cho bạn 3 lần rồi đó

k mình đi

x-23=78                     67-x=45                      x+345=678

x    =78+23               x     =67-45                  x       =678-345

x    =101                   x     =22                       x      =333

x-23=78

x     =78+23

x     =101

67-x=45

    x=67-45

    x=22

x+345=678

x       =678-345

x       =333

90280 ◠‿◠

Học tốt

90800316600

\(23\times45\times\left(45\times24-69\right)\times67\)

\(=23\times45\times\left(1080-69\right)\times67\)

\(=23\times45\times1011\times67\)

\(=1035\times1011\times67\)

\(=1046385\times67\)

\(=70107795\)

    67.12 + 67.89 - 67

= 67.(12 + 89 - 1)

= 67.100

= 6700

a) (26-6)*(-4)+31*(-7-13)

=-80+-620

=-700

hacker 2k6

$67\cdot12+67\cdot89-67$

$=67\cdot(12+89-1)$

$=67\cdot(101-1)$

$=67\cdot100$

$=6700$

ta có:

378 x 132 - 189 x 64 : 15

= 378 x 132 - 189 x 2 x 32 : 15

= 378 x 132 - 378 x 32 : 15 

= 378 x (132 -32) :15 

= 378 x 100 : 15 

= 37800 :15 

= 2520

18 + 21 + ....+ 48

= 3 x ( 6 + 7 +....+ 16 )

= 3 x 121

= 363

=> 2520 + 363

= 2883

\(\text{24×23+3×52}\)

\(=552+156\)

\(=708\)

hok tốt

24 x 23 + 3 x 52

= 3 x 8 x 23 + 3 x 52

= 3 x 184 + 3 x 52

= 3 x ( 184 + 52 )

= 3 x 236

= 708

\(24\times23+3\times52\)

\(=552+3\times52\)

\(=552+156\)

\(=708\)

hok tốt~~