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\(\text{0,29 x 8 x 1,25 = ?}\)
\(0.29X8=2.32\)
\(2.32X1.25=\text{2.9}\)
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a) y : 0,25 + y x 8 - y : 0,5 = 230
y x 4 + y x 8 - y x 2 = 230
y x (4 + 8 - 2) = 230
y x 10 = 230
y = 230 : 10
y = 23
b) \(x\) x 4 + \(x\) x 6 = 30
\(x\) x (4 + 6) = 30
\(x\) x 10 = 30
\(x\) = 30 : 10
\(x\) = 3
a; y :0,25 + y x 8 - y: 0,5 = 230
y x 4 + y x 8 - y x 2 = 230
y x (4 + 8 - 2) = 230
y x 10 = 230
y = 230 : 10
y = 23
b; \(x\) \(\times\) 4 + \(x\) \(\times\) 6 = 30
\(x\) \(\times\) (4 + 6) = 30
\(x\) \(\times\) 10 = 30
\(x\) = 30 : 10
\(x\) = 3
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\(\frac{5}{7}+y\times\frac{1}{2}=\frac{8}{7}:\frac{3}{2}\)
=> \(\frac{5}{7}+y\times\frac{1}{2}=\frac{8}{7}\times\frac{2}{3}\)
=> \(\frac{5}{7}+y\times\frac{1}{2}=\frac{16}{21}\)
=> \(y\times\frac{1}{2}=\frac{16}{21}-\frac{5}{7}=\frac{1}{21}\)
=> \(y=\frac{1}{21}:\frac{1}{2}=\frac{1}{21}\cdot2=\frac{2}{21}\)
5/7 + Y x 1/2 = 8/7 : 3/2
=> 5/7 + Y x 1/2 = 16/21
=> Y x 1/2 = 16/21 - 5/7
=> Y x 1/2 = 1/21
=> Y = 1/21 : 1/2
=> Y = 2/21
Hok tốt ^^
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= 64
Mọi người ơi đổi k nha
Please mik sẽ k lại mak
giúp mik lơn 150SP ik
Help me
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`7xx8xx12/6xx21xx16`
`=7xx8xx2xxx21xx16`
`=56xx2xx21xx16`
`=112xx21xx16`
`=2352xx16`
`=37632`
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\(x+x:0,25+x.2+x:0,125=0,45\)
\(\Leftrightarrow x+x:\dfrac{1}{4}+x.2+x:\dfrac{1}{8}=0,45\)
\(\Leftrightarrow x+x.4+x.2+x.8=0,45\)
\(\Leftrightarrow x\left(1+4+2+8\right)=0,45\)
\(\Leftrightarrow x.15=0,45\)
\(\Leftrightarrow x=0,03\)
X + X : 0.25 + X x 2 + X : 0.125 = 0.45
X + X x 4 + X x 2 + X x 8 = 0.45
X x (1+4+2+8)= 0.45
X x 15 = 0.45
X= 0.45 : 15
X= 0.03
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
8/15 - 2/15 : x = 0,2
2/15 : x = 8/15 - 0,2
2/15 : x = 1/3
x = 2/15 : 1/3
x = 2/5
em làm ngược lại thoi
2/15 : x = 8 /15 - 0,2
x = 2/15:( 8 /15 - 0,2)
B= ( 1 - 1/400 ) X ( 1 - 1/401 ) X ( 1- 1/402 ) X .... X ( 1 + 1/2010 )
Giúp tui với mọi người ơi !!
![](https://rs.olm.vn/images/avt/0.png?1311)
\(B=\left(1-\dfrac{1}{400}\right)\times\left(1-\dfrac{1}{401}\right)\times....\times\left(1-\dfrac{1}{2010}\right)\)
\(B=\dfrac{399}{400}\times\dfrac{400}{401}\times....\times\dfrac{2009}{2010}\)
\(B=\dfrac{399}{2010}\)
Sao nhóm cuối lại là 1 + \(\dfrac{1}{2010}\) trái với quy luật thế em
x(x-8) = 0
=> x = 0 hoặc x - 8 = 0
=> x = 0 hoặc x = 8
vậy__
x . ( x - 8 ) = 0
x - 8 = 0 : x
x - 8 = 0
x = 0 + 8
x = 8
Vậy x = 8