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`#qlv`
`(11)/(25) . (y + y5 - (23)/(55)) + 3/(14) . (56)/(25) = 1`
`=> (11)/(25) . (6y - (23)/(55)) + (12)/(25) = 1`
`=> (11)/(25) . (6y - (24)/(55)) = 1 - (12)/(25)`
`=> (11)/(25) (6y - (23)/(55)) = (13)/(25)`
`=> 6y - (23)/(55) = (13)/(25) : (11)/(25)`
`=> 6y - (23)/(55) = (13)/(11)`
`=> 6y = (13)/(11) + (23)/(55)`
`=> 6y = 8/5`
`=> y = 8/5 : 6`
`=> y = 8/5 . 1/6`
`=> y = 4/(15)`
Vậy `y = 4/(15)`
\(\dfrac{11}{25}\times\left(y+y\times5-\dfrac{23}{55}\right)+\dfrac{3}{14}\times\dfrac{56}{25}=1\)
\(\Rightarrow\dfrac{11}{25}\times\left(10\times y-\dfrac{23}{55}\right)+\dfrac{12}{25}-1=0\)
\(\Rightarrow\dfrac{22}{5}\times y-\dfrac{23}{125}-\dfrac{13}{25}=0\)
\(\Rightarrow\dfrac{22}{5}\times y=\dfrac{88}{125}\)
\(\Rightarrow y=\dfrac{88}{125}:\dfrac{22}{5}\)
\(\Rightarrow y=\dfrac{4}{25}\)
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Bài 1:
$(y+\frac{1}{3})+(y+\frac{1}{9})+(y+\frac{1}{27})+(y+\frac{1}{81})=\frac{56}{81}$
$(y+y+y+y)+(\frac{1}{3}+\frac{1}{9}+\frac{1}{27}+\frac{1}{81})=\frac{56}{81}$
$4\times y+\frac{40}{81}=\frac{56}{81}$
$4\times y=\frac{56}{81}-\frac{40}{81}=\frac{16}{81}$
$y=\frac{16}{81}:4=\frac{4}{81}$
Bài 2:
$18: \frac{x\times 0,4+0,32}{x}+5=14$
$18: \frac{x\times 0,4+0,32}{x}=14-5=9$
$\frac{x\times 0,4+0,32}{x}=18:9=2$
$x\times 0,4+0,32=2\times x$
$2\times x-x\times 0,4=0,32$
$x\times (2-0,4)=0,32$
$x\times 1,6=0,32$
$x=0,32:1,6=0,2$
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a)ta có: \(\frac{2}{3}=\frac{12}{x}\)
=>2x=3x12
=>x=(3x12):2=18
=>x=18
b)ta có\(\frac{14}{56}=\frac{1}{x}\)
=>14x=56x1
=>x=(56x1):14
=> x=4
k mik nha ^^
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mn nhanh mình tick , mình chỉ tick cho bạn 1 , 2 , 3 thui nhé nhanh
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56 - ( x - 14 ) = 22
x - 14 = 56 - 22
x - 14 = 34
x = 34 + 14
x = 48
172 - ( 137 - x ) = 93
137 - x = 172 - 93
137 - x = 79
x = 137 - 79
x = 58
1/ 56 - (x - 14) = 22 => x - 14 = 56 - 22 => x - 14 = 34 => x = 34 + 14 => x = 48
2/ 172 - (137 - x) = 93 => 137 - x = 172 - 93 => 137 - x = 79 => x = 137 - 79 => x = 58
Các bạn ơi mình cũng có câu trả lời nhé:
Y = 8