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x+200+200=200+200+100
x+400=500
x=500-400
x=100
tk minh nha
X+200+200=200+200+100
X+(200+200)=500
X+400=500
X=500-400
X=100
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 200 + 300 x 2 - 100 + ( -100)
= 200 + 600 - 100 + ( -100 )
= 800 - 100 + ( -100 )
= 700 + ( -100 )
= 600
b) 500 - 100 x 3 + ( -13 )
= 500 - 300 + ( -13 )
= 200 + ( -13 )
= 187
a ) 200 + 300 x 2 - 100 + ( - 100 )
= 200 + 600 - 100 + ( - 100 )
= 800 - 100 + ( - 100 )
= 700 + ( - 100 )
= 600
b ) 500 - 100 x 3 + ( - 13 )
= 500 - 300 + ( - 13 )
= 200 + ( - 13 )
= 187
![](https://rs.olm.vn/images/avt/0.png?1311)
X+100+100+200=200
X+(100+100+200)=200
X+400=200
X=200-400
X=-200
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(2^{x+2}-2^2=96\)
<=> \(2^x.2^2-2^x=96\)
<=> \(2^x\left(4-1\right)=96\)
<=> \(3.2^x=96\)
<=> \(2^x=32\)
<=> \(2^x=2^5\)
<=> x = 5
b, \(x-\left(\frac{50x}{100}+\frac{25x}{200}\right)=11\frac{1}{4}\)
\(\Rightarrow x-\left(\frac{1x}{2}+\frac{1x}{8}\right)=\frac{45}{4}\)
\(\Rightarrow x-\left(\frac{4x}{8}+\frac{1x}{8}\right)=\frac{45}{4}\)
\(\Rightarrow x-\frac{5x}{8}=\frac{45}{4}\)
\(\Rightarrow\frac{8x}{8}-\frac{5x}{8}=\frac{45}{4}\)
\(\Rightarrow\frac{3x}{8}=\frac{45}{4}\Rightarrow x=\frac{45}{4}\div\frac{3}{8}=30\)
Vậy x = 30
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![](https://rs.olm.vn/images/avt/0.png?1311)
x+1+x-2+x+3+x-4+.........+x+99+x-100=4*7*200
=>( x + x + ..... + x ) + ( 1 - 2 + 3 - 4 + 5 - 6 + ... + 99 - 100 ) = 5600
100 số hạng
=> 100x + [(1 - 2) + (3 - 4) +... + (99 - 100) = 5600
50 cặp
=> 100x + (-1)*50 = 5600
=> 100x + ( -50 ) = 5600
=> 100x = 5600 - ( -50 )
=> 100x = 5650
=> x = 5650 : 100
=> x = 56,5
![](https://rs.olm.vn/images/avt/0.png?1311)
100 x 2 + ( 5 x 200 ) + 120 x 5
= 100 x 2 + 1000 + 120 x 5
= ( 100 x 2 ) + 1000 + ( 120 x 5 )
= 200 + 1000 + 600
= 1800
100 x x = 200 x 2
100 x x = 400
x = 400 :100
x = 4
Vậy x = 4
100 * x = 200 * 2
100 * x = 400
x = 400 : 100
x = 4
k mk nha