( 320 + X ) : X + 120 = 131
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![](https://rs.olm.vn/images/avt/0.png?1311)
a) 120 x 40 > 120 : 40
b) 280 + 70 < 280 x 70
c) 320 – 80 > 320 : 80
d) 610 + 0 = 610 – 0
![](https://rs.olm.vn/images/avt/0.png?1311)
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
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
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
![](https://rs.olm.vn/images/avt/0.png?1311)
`@` `\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
![](https://rs.olm.vn/images/avt/0.png?1311)
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
![](https://rs.olm.vn/images/avt/0.png?1311)
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
![](https://rs.olm.vn/images/avt/0.png?1311)
(x-14)-20=5
=> x-14 = 25
=> x = 39
Các dạng toán như này lớp 6 ai cũng làm được cả * lười vừa thôi*
(320 + x) : x + 120 = 131
(320 + x) : x = 131 - 120
(320 + x) : x = 11
320 : x + x : x = 11
320 : x + 1 = 11
320 : x = 11-1
320 : x = 10
x = 320 : 10
x = 32
( 320 + x ) : x + 120 = 131
( 320 + x ) : x = 131 - 120
( 320 + x ) : x = 11
320 : x + x : x = 11
320 : x + 1 = 11
320 : x = 11 - 1
320 : x = 10
x = 320 : 10
x = 32