a) 120 x 40 > 120 : 40

b) 280 + 70 < 280 x 70

c) 320 – 80 > 320 : 80

d) 610 + 0 = 610 – 0

120 x 64 + 320 - 25 x 4 x 16

= 120 x 64 + 64 x 5 - 25 x 64

= 64 x ( 120 + 5 - 25 )

= 64 x 100

= 6400

mk đúng đó

120 x 64 + 320 - 25 x 4 x 16 = 6400

k cho mk nha

120 x 64 + 320 - 25 x 4 x 16 = 7680 + 320 - 100 x 16

                                              = 8000 - 1600 = 6400

x + 120 = 320

          x = 320 - 120

          x = 200                    ai k mk,mk k lại~~

= 200

mik k bn rùi nhé

x+120=320

      x =320-120 

      x =200.

120 x 64 + 320 - 25 x 4 x 16 

= ( 120 x 64) + 320 - (25 x 4 x 16) 

= 7680 + 320 - ( 100 x 16 )

= 8000 - 1600

= 6400

`@` `\text {Ans}`

`\downarrow`

`a)`

`2 \times x + 34 = 168`

`=> 2x = 168 - 34`

`=> 2x = 134`

`=> x = 134 \div 2`

`=> x = 67`

Vậy, `x=67`

`b)`

`x \times 11 + 51 = 273`

`=> 11x = 273 - 51`

`=> 11x = 222`

`=> x = 222 \div 11`

`=> x = 222/11`

`c)`

`x \div 120 - 45 = 155`

`=> x \div 120 = 155 + 45`

`=> x \div 120 = 200`

`=> x = 200 \times 120`

`=> x = 24000`

Vậy, `x = 24000`

`d)`

`320 \div x - 127 = 33`

`=> 320 \div x = 33+127`

`=> 320 \div x = 160`

`=> x = 320 \div 160`

`=> x = 2`

Vậy, `x=2.`

`@` `\text {Kaizuu lv uuu}`

a)2 x x +34 =168

2 x X = 168 - 34

2 x X = 134

X= 134:2

X= 67

b) x x 11 + 51 = 273

X x 11 = 273 - 51

X x 11= 222

X= 222 :11

X= 222/11

c) x : 120 – 45 = 155

x:120= 155+45

x:120=200

x=200:120

x=5/3

d) 320 : x – 127 = 33

320: x= 33+127

320:x=160

x=320:160

x=2

120 x 64 + 320 - 25 x 4 x 16 = 120 x 4 x 16 + 20 x 16 - 100 x 16

= 480 x 16 + 20 x 16 - 100 x 16

= 16 x (480 + 20 - 100)

= 16 x 400

= 6400

a) x = 34             

b) x= 5                

c) x = 35              

d) x = 0

e) x = 410            

f) x= 170

Bài làm :

\(a,23+x:2=37\)

\(x:2=14\)

\(x=14\times2\)

\(x=28\)

\(b,x-320:32=4\times16\)

\(x-10=64\)

\(x=64+10\)

\(x=74\)

\(c,3x-2018:2=23\)

\(3x-1009=23\)

\(3x=23+1009\)

\(3x=1032\)

\(x=344\)

\(d,\left(9x-21\right):3=2\)

\(9x-21=6\)

\(9x=6+21\)

\(9x=27\)

\(x=3\)

\(e,15:x+120:12=15\)

\(15:x+10=15\)

\(15:x=15-10\)

\(15:x=5\)

\(x=3\)

Học tốt nhé

(x-14)-20=5

=> x-14 = 25

=> x = 39

Các dạng toán như này lớp 6 ai cũng làm được cả * lười vừa thôi*

( x - 14 ) - 20 = 5

 x - 14 = 5 + 20

 x - 14 = 25

 x = 25 + 14

 x = 39

128 + ( 202 - x ) = 330

           [ 202 - x ] = 330 - 128

             202 - x = 202

                      x = 202 - 202

                      x = 0

( x - 120 ) x 9 = 450

[ x - 120 ] = 450 : 9

 x - 120 = 50

 x = 50 + 120

 x = 170

x - 320 : 32 = 25 x 16

x - 320 : 32 = 400

x - 320 = 400 x 32

x - 320 = 12800

x = 12800 + 320

x = 13120

25 - ( 2x +10 ) = 5

        [ 2x + 10] = 25 - 5

          2x + 10 = 20

          2x = 20 - 10

          2x = 10

            x = 10 : 2

            x = 5

315 - ( 135 - x ) = 215

          [ 135 - x ] = 315 - 215

          [ 135 - x ] = 100

                      x = 135 - 100

                      x = 35

x : 2 + 21 : 3 = 37

x : 2 + 21 = 37 x 3

x : 2 + 21 = 111

x : 2 = 111 - 21

x : 2 = 90

x = 90 x 2

x = 180

4 x ( x + 100 ) = 800

      [ x + 100 ] = 800 : 4

      [ x + 100 ] = 200

       x = 200 - 100

       x = 100

504 : ( 16 - 5x ) = 72

          [ 16 - 5x ] = 504 : 72

           [ 16 - 5x ] = 7

                     5x = 16 - 7

                     5x = 9

                       x = \(\dfrac{9}{5}\)

( x - 5 ) : 7 + 3 = 20

[ x - 5 ] : 7 = 20 - 3

[ x - 5 ] : 7 = 17

[ x - 5 ] = 17 x 7

 x - 5 = 119

 x = 119 + 5

 x = 124