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`@` `\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)
(x-14)-20=5
=> x-14 = 25
=> x = 39
Các dạng toán như này lớp 6 ai cũng làm được cả * lười vừa thôi*
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a, (x-35)-120=0
x-35=120+0
x-35=120
x=120+35
x=155
b,7x-8=713
7x=713+8
7x=721
x=721:7
x=103
c,4x:17=0
4x=0.17
4x=0
x=0:4
x=0
d,75+(131-x)=205
131-x=205-75
131-x=130
x=131-130
x=1
e,2x-36=4^6:4^3
2x-36=4^6-3
2x-36=4^3
2x-36=48
2x=48-36
2x=12
x=12:2
x=6
f, 2011^2.2011^x=2011^6
2011^x=2011^6: 2011^2
2011^x=2011^6-2
2011^x=2011^4
x=4
bn
\(\text{a/ ( x-35 ) - 120 = 0}\)
\(\Rightarrow\left(x-35\right)=120\)
\(\Rightarrow x=120+35\)
\(x=155\)
\(\text{b/ 7x - 8 = 713}\)
\(\Rightarrow7x=713+8=721\)
\(x=721:7=103\)
\(\text{c/ 4x : 17 = 0}\)
\(4x=0\)
\(x=0\)
\(\text{d/ 75+(131-x) = 205}\)
\(131-x=205-75=130\)
\(x=131-130=1\)
\(e.2x-36=4^6:4^3\)
\(2x-36=4^3=64\)
\(2x=64+36=100\)
\(x=100:2=50\)
\(f.2011^2.2011^x=2011^6\)
\(\text{Ta có công thức }:x^n.x^m=x^{n+m}\)
\(\Rightarrow x=6-2=4\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 2:
a: 4x+320=480
=>4x=160
hay x=40
b: 150-x:7=120
=>x:7=30
hay x=210
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, -x+31=-69+39
-x+31=-30
-x=-30-31
-x=-61
Vậy x=61
b -120+30+x=-50
-90+x=-50
x=-90--50
x=-40
các câu còn lại cũng thế
(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