Tìm x biết : x+x:0,1+x:0,2+x:0,25= 192
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a) Ta có: \(\left(x-3\right)^2-2\left(x-3\right)=0\)
\(\Leftrightarrow\left(x-3\right)\left(x-5\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=3\\x=5\end{matrix}\right.\)
b) Ta có: \(x:0.25+x:0.2+x:0.1+x=34\)
\(\Leftrightarrow4x+5x+x+x=34\)
\(\Leftrightarrow11x=34\)
hay \(x=\dfrac{34}{11}\)
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X : 0,25 - X : 0,5 = 25,2
X x 4 - X x 2 = 25,2
X x ( 4 - 2 ) =25,2
X x 2 = 25,2
X = 25,2 : 2
X 12,6
X : 0,25 - x : 0,5 = 25,2
x x 4 - X x 2 = 25,2
X x ( 4 - 2 ) = 25,2
X x 2 = 25,2
X = 25,2 : 2
X = 12,6
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0,1 : x + 1,2 : x + 2,3 : x + ...+ 8,9 : x = 13,5
\(\frac{1}{x}\times\left(0,1+1,2+2,3+...+8,9\right)=13,5.\)
\(\frac{1}{x}\times40,5=13,5\)
1/x = 1/3
=> x = 3
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( 0,25 x 36 +0,1 x 110 ) x 0,5 - ( 150 x 0,2 - 96 : 4 ) = 4
k mình nhé
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(0,25 x 36 + 0,1 x 110) x 0,5 - (150 x 0,2 - 96 : 24)
= (9 + 11) x 0,5 - (30 - 24)
= 20 x 0,5 - 6
= 10 - 6
= 4
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(0,25 x 36 + 0,1 x 110) x 0,5 - (150 x 0,2 - 96 : 4)
= (0,25 x 4 x 9 + 0,1 x 10 x 11) : 2 - (150 : 5 - 96 : 4)
= (1 x 9 + 1 x 11) : 2 - (30 - 24)
= (9 + 11) : 2 - 6
= 20 : 2 - 6
= 10 - 6 = 4
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a x 0,1 = a : \(\dfrac{1}{10}\)
a : 0,01 = a x \(\dfrac{1}{100}\)
a x 1000 = a : 0,001
a : 1000 = a x \(\dfrac{1}{1000}\)
\(x\) : 0,2 = \(x\) x \(\dfrac{1}{5}\)
\(x\) : 0,25 = \(x\) x \(\dfrac{1}{4}\)
\(x\) : 0,125 = \(x\) x \(\dfrac{1}{8}\)
\(x\) : 0,5 = \(x\) x \(\dfrac{1}{2}\)
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