Tim x
x+8-2:2=8
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\(\frac{5}{8}-\frac{3}{8}.x=\left(-\frac{1}{2}\right)^4+\frac{5}{6}\)
\(\Leftrightarrow\frac{5}{8}-\frac{3}{8}.x=\frac{1}{16}+\frac{5}{6}\)
\(\Leftrightarrow\frac{3}{8}.x=\frac{5}{8}-\left(\frac{1}{16}+\frac{5}{6}\right)\)
\(\Leftrightarrow\frac{3}{8}.x=\frac{5}{8}-\frac{5}{96}\)
\(\Leftrightarrow\frac{3}{8}.x=\frac{55}{96}\)
\(\Leftrightarrow x=\frac{55}{96}:\frac{3}{8}\)
\(\Leftrightarrow x=\frac{55}{36}\)
Vậy : \(x=\frac{55}{36}\)
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Điều kiện: 4 − x x + 2 ≥ 0 ⇔ x ∈ − 2 ; 4
x 2 − 2 x − 8 = 4 4 − x x + 2 ⇔ x 2 − 2 x − 8 = 4 − x 2 − 2 x − 8
Đặt t = − x 2 − 2 x − 8 , t ≥ 0
⇔ t 2 = − x 2 − 2 x − 8 ⇔ x 2 − 2 x − 8 = − t 2
1 ⇔ − t 2 = 4 t ⇔ t 2 + 4 t = 0 ⇔ t = 0 ( n ) t = − 4 ( l ) ⇔ − x 2 − 2 x − 8 = 0
⇔ − x 2 − 2 x − 8 = 0 ⇔ x = − 2 ( T M ) x = 4 ( T M )
Vậy phương trình đã cho có hai nghiệm
Đáp án cần chọn là: D
a, \(x + 1/6 = -3/8 \)
\(x = -3/8 - 1/6\)
\(x = -13/24\)
Vậy \(x = -13/24\)
b, \(-3/7 - x = 4/5 - 2/3\)
\(-3/7 - x = 2/15\)
\(x = -3/7 - 2/15\)
\(x = -59/105.\)
Vậy \(x = -59/105\)
x+1/6=-3/8
x=-3/8-1/6
x=-13/24
-3/7-x=4/5+-2/3
-3/7-x=2/15
x=-3/7-2/15
x=-59/105
\(\dfrac{\left(x+1\right)^2}{8}=\dfrac{8}{x+1}\\ \Rightarrow\left(x+1\right)^2\left(x+1\right)=8\cdot8\\ \left(x+1\right)^3=64\\ \left(x+1\right)^3=4^3\\ \Rightarrow x+1=4\\ x=3\)
\(\dfrac{\left(x+1\right)^2}{8}=\dfrac{8}{x+1}\)
\(\Leftrightarrow\left(x+1\right)^3=64=4^3\)
\(\Leftrightarrow x+4=1\Rightarrow x=3\)
`x xx 6/7=5/14`
`=>x=5/14:6/7`
`=>x=5/14xx7/6`
`=>x=35/84`
`=>x=5/12`
Vậy `x=5/12`
__
`x:2/3=4/9`
`=>x=4/9xx2/3`
`=>x=8/27`
Vậy `x=8/27`
__
`x-1/4=3/2`
`=>x=3/2+1/4`
`=>x=6/4+1/4`
`=>x=7/4`
Vậy `x=7/4`
__
`x+4/5=8/9`
`=>x=8/9-4/5`
`=>x=40/45-36/45`
`=>x=4/45`
Vậy `x=4/45`
\(x\cdot\dfrac{6}{7}=\dfrac{5}{14}\)
\(x\) \(=\dfrac{5}{14}:\dfrac{6}{7}\)
\(x\) \(=\dfrac{5}{12}\)
\(x:\dfrac{2}{3}=\dfrac{4}{9}\)
\(x\) \(=\dfrac{4}{9}\cdot\dfrac{2}{3}\)
\(x\) \(=\dfrac{8}{27}\)
\(x-\dfrac{1}{4}=\dfrac{3}{2}\)
\(x\) \(=\dfrac{3}{2}+\dfrac{1}{4}\)
\(x\) \(=\dfrac{7}{4}\)
\(x+\dfrac{4}{5}=\dfrac{8}{9}\)
\(x\) \(=\dfrac{8}{9}-\dfrac{4}{5}\)
\(x\) \(=\dfrac{4}{45}\)
x + 8 - 2 : 2 = 8
x + 8 - 1 = 8
x + 8 = 8 + 1
x + 8 = 9
x = 9 - 8
x = 1
x + 8 - 2 : 2 = 8
x + 8 - 1 = 8
x + 8 = 8 + 1
x + 8 = 9
x = 9 - 8
x = 1