(-5,6) : 3,5 = x : 25
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a)Ta có:
\(\left(x-3,5\right)^2+\left(y-\dfrac{1}{10}\right)^4\le0\)
\(\Rightarrow x-3,5=y-\dfrac{1}{10}=0\Leftrightarrow\left\{{}\begin{matrix}x=3,5\\y=\dfrac{1}{10}=0,1\end{matrix}\right.\)
b) Ta có:
\(\left(5x+1\right)^2=\dfrac{36}{49}\)
\(\Leftrightarrow\left[{}\begin{matrix}5x+1=\dfrac{6}{7}\\5x+1=\dfrac{-6}{7}\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{-1}{35}\\x=\dfrac{-13}{35}\end{matrix}\right.\)
b: ta có: \(\left(5x+1\right)^2=\dfrac{36}{49}\)
\(\Leftrightarrow\left[{}\begin{matrix}5x+1=\dfrac{6}{7}\\5x+1=-\dfrac{6}{7}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}5x=\dfrac{-1}{7}\\5x=\dfrac{-13}{7}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{-1}{35}\\x=\dfrac{-13}{35}\end{matrix}\right.\)
4,5 - x + 1,14 = 1,8
4,5 - x = 1,8 - 1,14
4,5 - x = 0,36
x = 4,5 - 0,36
x = 4.14
14 : ( x : 3,5 ) = 5,6
( x : 3,5 ) = 14 : 5,6
( x : 3,5 ) = 2,5
x = 2,5 x 3,5
x =8,75
a, 4,5 - x + 1,14 = 1,8
4,5 - x = 1,8 - 1,14
4,5 - x = 0,66
x = 4,5 - 0,66
x = 3,84
Vậy x = 3,84
b, 14 : ( x : 3,5 ) = 5,6
( x : 3,5 ) = 14 : 5,6
x : 3,5 = 2,5
x = 2,5 x 3,5
x = 8,75
Vậy x = 8,75
\(\left(3x-16\right).49=343\)
\(=>3x-16=7\)
\(=>3x=23\)
\(=>x=\frac{23}{3}\)
\(4,5-x+1,14=1,8\)
\(=>4,5-x=\frac{33}{50}\)
\(=>x=\frac{96}{25}\)
\(14:\left(x:3,5\right)=5,6\)
\(=>x:3,5=2,5\)
\(=>x=8,75\)
( 3x - 16 ) x 49 = 343
3x - 16 = 434 : 49 = \(\frac{62}{7}\)
3x = \(\frac{62}{7}-16\)
3x = \(-\frac{50}{7}\)
x = \(-\frac{50}{7}:3\)
x = -\(\frac{50}{21}\)
4,5 - x + 1,14 = 1,8
4,5 - x = 1,8 - 1,14 = 0,66
x = 4,5 - 0,66
x = 3,84
14 : ( x : 3,5 ) = 5,6
x : 3,5 = 14 : 5,6 = 2,5
x = 2,5 x 3,5
x = 8,75
( 5,6 x 27 + 56 x 3,5 ) : 6,2
=56(2,7+3,5):6,2
=56.6,2:6,2
=56
ko ghi lại đề bài
=56.(2,7+3,5):6,2
=56:6,2:6,2
=56
hc tốt
Lời giải:
$y\times 3,5=22,19$
$y=22,19:3,5=6,34$
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$48,3-y\times 2,8=30,716$
$y\times 2,8=48,3-30,716=17,584$
$y=17,584:2,8=6,28$
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$y:5,7-5,6=12,5$
$y:5,7=12,5+5,6=18,1$
$y=18,1\times 5,7=103,17$
a) \(x=-\dfrac{3}{5}\times\dfrac{9}{7}=-\dfrac{27}{35}\)
b) \(x\left(0,4-\dfrac{1}{5}\right)=\dfrac{3}{4}\)
\(x=\dfrac{3}{4}:\dfrac{1}{5}=\dfrac{15}{4}\)
a, \(x=-3,5.\dfrac{9}{7}=-\dfrac{9}{2}\)
b, \(\dfrac{2}{5}x-\dfrac{1}{5}x=\dfrac{3}{4}\Leftrightarrow\dfrac{1}{5}x=\dfrac{3}{4}\Leftrightarrow x=\dfrac{3}{4}:\dfrac{1}{5}=\dfrac{15}{4}\)
(-5,6 ):3,5 = x : 25
=> x : 25 = -1,6
=> x = -1,6 x 25
Vậy x = -40