Xx2+Xx3+X=2021
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8x - 3x = 430
x( 8 - 3 ) = 430
5x = 430
x = 430 : 5
x = 86
![](https://rs.olm.vn/images/avt/0.png?1311)
( X x 2 + 3 + 4 + 1 ) = 2130
X x 10 = 2130
X = 2130 : 10
X = 213
Xx2+Xx3+Xx4+X=2130
Xx(2+3+4+1) =2130
Xx10 =2130
X =2130:10
X =213
![](https://rs.olm.vn/images/avt/0.png?1311)
Viết lại cái đề:
\(x+x-x\times2-x\times3=x+205\)
\(\Leftrightarrow2x-2x-3x=x+205\)
\(\Leftrightarrow-3x=x+205\)
\(\Leftrightarrow-3x-x=205\)
\(\Leftrightarrow-4x=205\)
\(\Leftrightarrow x=-\frac{205}{4}\)(Ghi là -51,25 cũng dc nhé)
PS: Toán lớp 6 thì đúng hơn.
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X x 3 + X x 2 + x - 2389 = 3779
X x ( 3 + 2 + 1 ) = 3779 + 2389
X x 6 = 6162
X = 6168 : 6
X =1028
X x 3+ X x 2+ X-2389=3779
Xx(3+2+1)=3779+2389
Xx6=6168
X=6168:6=1028
![](https://rs.olm.vn/images/avt/0.png?1311)
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X x 2 + 85 + X x 3 = 195
X x (2 + 3) = 195 - 85
X x 5 = 110
X = 110 : 5
X = 22
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(Xx1)+(Xx2)+(Xx3)+(Xx4)=50
=>4xX+10=50
=>4xX=50-10
=>4xX=40
=>X=40:10
=>X=4
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![](https://rs.olm.vn/images/avt/0.png?1311)
x*2 + x*3 + x*4 + x*5 + x*6 = x*9 + 9999
=> x*(2 + 3 + 4 + 5 + 6) = x*9 + 9999
=> x*20 = x*9 + 9999
=> x*20 - x*9 = 9999
=> x*11 = 9999
=> x = 909
xx2 + xx3 +xx4+ xx5 + xx6 =xx9 + 9999
xx2 + xx3 + xx4 + xx5 + xx6 -xx9 = 9999
xx*10+2+ xx*10+3+xx*10+4+xx*10+5+xx*10+6-xx*10+9 = 9999
(xx*10+xx*10+xx*10+xx*10+xx*10-xx*10) + (2+3+4+5+6-9) = 9999
xx * (10+10+10+10+10-10) + 11 = 9999
xx*(10*5-10) = 9988
sai đề rồi