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( 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
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![](https://rs.olm.vn/images/avt/0.png?1311)
Xx2+Xx4+Xx6+...+Xx18+Xx20
=Xx(2+4+6+...+18+20)
=Xx 110
=??????????????
![](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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\(a,x\times2+x\times8=960\)
\(x\times\left(2+8\right)=960\)
\(x\times10=960\)
\(x=960:10\)
\(x=96\)
\(b,x\times13-x\times4=612\)
\(x\times\left(13-4\right)=612\)
\(x\times9=612\)
\(x=612:9\)
\(x=68\)
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X x 3+ X : 4 =26
X x 3 + X x 1/4 = 26
X x ( 3 + 1/4 ) = 26
X x 13/4 = 26
X = 26 : 13/4
X = 8
\(x\) \(\times\) 3 + \(\dfrac{x}{4}\) = 26
\(x\times3+x\times\dfrac{1}{4}\)=26
\(x\times\left(3+\dfrac{1}{4}\right)\) = 26
\(x\times\dfrac{13}{4}\) = 26
\(x=26:\dfrac{13}{4}\)
\(x=8\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x.2+x.3+x.4=108\)
\(x.\left(2+3+4\right)=108\)
\(x.9=108\)
\(x=108:9\)
\(x=12\)