X x 3+X : 0,5 =40 ??????
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\(0,5\times40\times0,2\times20\times0,25\)
\(=\left(0,5\times0,2\right)\times\left(40\times20\times0,25\right)\)
\(=0,1\times200\)
\(=20\)
~ Hok tốt ~
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\(=\frac{3}{x}+55+\frac{50}{5}-x\)
\(=\frac{3}{x}+55+10-x\)
\(=\frac{3}{x}+65-x\)
\(=\frac{3+65x-x^2}{x}\)
\(=\frac{3+x.\left(65-x\right)}{x}\)
\(=\frac{3}{x}+\frac{x}{x}.\left(\frac{65-x}{x}\right)\)
\(=\frac{3}{x}+1.\left(\frac{65}{x}-\frac{x}{x}\right)\)
\(=\frac{3}{x}+\frac{65}{x}-1\)
\(=\frac{68}{x}-1\)
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140 - 0,5 x 40 x 5 x 0,2 x 20 x 0,25 - 40
= (140 - 40 ) - (0,5x20) x (40 x 0,25)
= 100 - 100
= 0
140 - 0,5 x 40 x 5 x 0,2 x 20 x 0,25 - 40
= (140 - 40 ) - (0,5x20) x (40 x 0,25)
= 100 - 100
= 0
tìm nghiệm của đa thức một biến:
a, x(x-5)-(x-5)*(3x+2)
b,2*(0,3x-0,5x)-0,5(3-x)
c,(x-1)-(x-2)=(-x-40-8
![](https://rs.olm.vn/images/avt/0.png?1311)
a. \(x\left(x-5\right)-\left(x-5\right)\left(3x+2\right)=0\)
\(\Rightarrow\left(x-5\right)\left[x-\left(3x+2\right)\right]=0\)
\(\Rightarrow\left(x-5\right)\left(x-3x-2\right)=0\)
\(\Rightarrow\left(x-5\right)\left(-2x-2\right)=0\)
\(\Rightarrow-2\left(x-5\right)\left(x+1\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}-2\ne0\\x-5=0\\x+1=0\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}-2\ne0\\x=5\\x=-1\end{matrix}\right.\)
b. \(2\left(0,3x-0,5x\right)-0,5\left(3-x\right)=0\)
\(\Rightarrow-0,4x-1,5+0,5x=0\)
\(\Rightarrow0,1x-1,5=0\)
\(\Rightarrow0,1x=1,5\)
\(\Rightarrow x=\dfrac{1,5}{0,1}=15\)
c. \(\left(x-1\right)-\left(x-2\right)=\left(-x-40\right)-8\)
\(\Rightarrow x-1-x+2=-x-40-8\)
\(\Rightarrow1=-x-48\)
\(\Rightarrow1+48=-x\)
\(\Rightarrow x=-49\)
![](https://rs.olm.vn/images/avt/0.png?1311)
X : 0,125 + X : 0,5 + X x 10 = 40
x : ( 0,125 + 0,5 + 10 ) = 40
x : 10,625 = 40
x = 40 x 10,625
x = 425
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\(x\) + \(x\): 0,25 + \(x\) : 0,5 + \(x\) : 0,125 = 40
\(x\) \(\times\) 1+ \(x\) \(\times\) 4 + \(x\) \(\times\) 2 + \(x\times\) 8 = 40
\(x\) \(\times\) ( 1 + 4 + 2 + 8) = 40
\(x\) \(\times\) 15 = 40
\(x\) = 40 : 15
\(x\) = \(\dfrac{8}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Xx3+X :0,5=40
Xx3+Xx2 =40
Xx(3+2) =40
Xx5 =40
X =40:5
X =8
:0,5=x2 bạn nhé
X x 3 + X : 0,5 = 40
X x 3 + X x 2=40
X x (3+2) = 40
X x 5 = 40
X = 40 : 5
X =8
nhớ cho mik nhé