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a) \(\left(\dfrac{1}{4}x\right):3=\dfrac{5}{6}:\dfrac{1}{8}\\ \left(\dfrac{1}{4}x\right):3=\dfrac{20}{3}\\ \dfrac{1}{4}x=\dfrac{20.3}{3}\\ \dfrac{1}{4}x=20\\ x=80\)
a: Ta có: \(\dfrac{0.25x}{3}=\dfrac{5.6}{0.125}\)
\(\Leftrightarrow x\cdot\dfrac{1}{4}=134.4\)
hay x=537,6
b: Ta có: \(\dfrac{2.5}{7.5}=x:\dfrac{3}{5}\)
\(\Leftrightarrow x:\dfrac{3}{5}=\dfrac{1}{3}\)
hay \(x=\dfrac{1}{5}\)
\(a,-0,52:x=-9,36:16,38\)
\(\Leftrightarrow\frac{-13}{25}:x=\frac{-4}{7}\)
\(\Leftrightarrow x=\frac{-13}{25}:\frac{-4}{7}\)
\(\Leftrightarrow x=\frac{91}{100}\)
\(b,\frac{x}{-15}=\frac{-60}{x}\)
\(\Leftrightarrow x^2=900\)
\(\Leftrightarrow x^2=\left(30,-30\right)^2\)
\(\Leftrightarrow\orbr{\begin{cases}x=30\\x=-30\end{cases}}\)
\(c,\frac{-2}{x}=\frac{-x}{8}\)
\(\Leftrightarrow-\left(x^2\right)=-16\)
\(\Leftrightarrow x^2=16\)
\(\Leftrightarrow x^2=\left(4,-4\right)^2\)
\(\Leftrightarrow\orbr{\begin{cases}x=-4\\x=4\end{cases}}\)
\(d.3,8\div2x=\frac{1}{4}:2\frac{2}{3}\)
\(\Leftrightarrow3,8\div2x=\frac{3}{32}\)
\(\Leftrightarrow2x=3,8\div\frac{3}{32}\)
\(\Leftrightarrow2x=\frac{608}{15}\)
\(\Leftrightarrow x=\frac{608}{15}\div2\)
\(\Leftrightarrow x=\frac{304}{15}\)
\(e.0,25x\div3=\frac{5}{6}:0,125\)
\(\Leftrightarrow0,25x\div3=\frac{20}{3}\)
\(\Leftrightarrow0,25x=\frac{20}{3}.3\)
\(\Leftrightarrow\frac{1}{4}x=20\)
\(\Leftrightarrow x=20:\frac{1}{4}\)
\(\Leftrightarrow x=80\)
( 0,25 . x ) : 3 = 20/3
( 0,25 . x ) = 20/3 .3
( 0,25 . x ) = 20
x = 20 : 0,25
x = 80
\(a,3,8:2x=\frac{1}{4}:2\frac{2}{3}\)
\(\Leftrightarrow3,8:2x=\frac{3}{32}\)
\(\Leftrightarrow2x=3,8:\frac{3}{32}\)
\(\Leftrightarrow2x=\frac{608}{15}\)
\(\Leftrightarrow x=\frac{304}{15}\)
\(b,0,25x:3=\frac{5}{6}:0,125\)
\(\Leftrightarrow0,25x:3=\frac{20}{3}\)
\(\Leftrightarrow0,25x=20\)
\(\Leftrightarrow x=80\)
\(c,0,01:2,5=0,75x:0,75\)
\(\Leftrightarrow0,75x:0,75=\frac{1}{250}\)
\(\Leftrightarrow x=\frac{1}{250}\)
Mik lm hơi tắt chỗ nào chw hiểu thì hỏi mik nhé
a, Ta có: 27/x = 9/14
27/x = 27/42
Vậy x = 42
b, 5/0,18 = 12,5/x
Suy ra 5.x = 0,18 . 12,5
5.x = 2,25
x = 2,25 : 5
x = 0,45 = 9/10
Vậy x = 9/10
c, 0,25x : 3 = 5/6 : 0,125
1/4x : 3 = 5/6 : 1/8
1/4x : 3 = 5/6 . 8
1/4x : 3 = 20/3
1/4x = 20/3 . 3
1/4x = 20
x = 20 : 1/4
x = 20 . 4
x = 80
Vậy x = 80
d, x/-15 = -60/x
Suy ra x . x= -15 . (-60)
x2 = 900
x2 = 302
Suy ra x=30
Vậy x = 30
Chúc bạn học tốt
\(a,7,8:2x=\frac{1}{4}:2\frac{2}{3}\)
\(7,8:2x=\frac{3}{32}\)
\(2x=7,8:\frac{3}{32}\)
\(2x=\frac{416}{5}\)
\(x=\frac{416}{5}:2\)
\(x=\frac{208}{5}\)
\(b,0,25x:3=\frac{5}{6}:0,125\)
\(0,25x:3=\frac{20}{3}\)
\(0,25x=\frac{20}{3}\times3\)
\(0,25x=20\)
\(x=20:0,25\)
\(x=80\)
0,25x : 3 = \(\frac{5}{6}\) : 0,125
0,25x : 3 = \(\frac{5}{6}\): \(\frac{1}{8}\)
0,25x : 3 = \(\frac{20}{3}\)
0,25x = \(\frac{20}{3}\)x 3
0,25x = 20
x = 20 : 0,25
x = 80
thanks