30 % nhân x + x = 52
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\(\frac{x}{17}+\frac{19}{34}=2\frac{1}{2}\)
\(\Rightarrow\frac{2x}{34}+\frac{19}{34}=2\frac{1}{2}\)
\(\Rightarrow\frac{2x+19}{34}=2\frac{1}{2}\Rightarrow2x+19=34.2\frac{1}{2}\Rightarrow2x+19=85\Rightarrow2x=66\Rightarrow x=33\)
b) 30% * x + x =52
=> 3/10 * x + x=52
=> x * ( 3/10 + 1 ) = 52
=> x *1,3 = 52
=> x = 52 : 1,3 =40
\(\frac{x}{17}+\frac{19}{34}=2\frac{1}{2}=\frac{5}{2}\)
\(\frac{x}{17}=\frac{5}{2}-\frac{19}{34}\)
\(\frac{x}{17}=\frac{170}{68}-\frac{38}{68}\)
\(\frac{x}{17}=\frac{132}{68}\)
=>\(x.68=17.132\)
\(x.68=2244\)
\(x=2244:68\)
\(x=33\)
vậy x=33
dấu"." chính là phép nhân đó em!!!
chúc em học giỏi...
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x - 40% . x = 36 30% . x + x = 52
=> x - 2/5.x = 36 => 3/10 .x + x = 52
=> x(1 - 2/5) = 36 => (3/10 + 1).x = 52
=> x. 3/5 = 36 => 13/10.x = 52
=> x = 36 : 3/5 => x = 52 : 13/10
=> x = 60 => x = 40
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\(2\times30-x-x=52\)
\(60-2x=52\)
\(-2x=52-60\)
\(-2x=-8\)
\(x=\left(-8\right):\left(-2\right)\)
\(x=4\)
Vậy \(x=4\)
2 x 30 - X - X = 52
60 = 52 + X x 2
60 - 52 = X x 2
8 = X x 2
8 : 2 = X
4 = X
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: 30%xX+X=52
nên 130%xX=52
X=52:130%=40
Vậy X= 40
40 bạn ơi
30% x X + X = 52
30 % x X + X x 100% = 52
130 % x X = 52
X = 52 x 100 / 130
X = 40
nhớ k cho mình nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
\(30\%\cdot x+x=52\)
\(\left(\frac{3}{10}+1\right)x=52\)
\(\frac{13}{10}x=52\)
\(x=40\)
\(\text{Ta có: 30% * x + x= 52 }\)
\(\Rightarrow\frac{3}{10}x+x=52\)
\(\Rightarrow\left(\frac{3}{10}+1\right)x=52\)
\(\Rightarrow\frac{13}{10}x=52\)
![](https://rs.olm.vn/images/avt/0.png?1311)
30%.x+x = 52
\(\frac{30}{100}\).x +x = 52
\(\frac{3}{10}\). x+ x = 52
\(\left(\frac{3}{10}+1\right)x\)= 52
\(\frac{13}{10}\) .x = 52
x =\(52:\frac{13}{10}\)
x = \(40\)
k mik nha