Tìm X
27 : x - 1 / 2 = 15 /7 :5
2 . x -3 / 4= 15 /9 . 3 / 5
Gỉải gúp mình nhé . Mai phải nộp bài rồi
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`a)5/8x+2/5=1/5`
`=>5/8x=1/5-2/5`
`=>5/8x=-1/5`
`=>x=-1/5:5/8=-8/25`
`b)5/7:x+11/7=18/7`
`=>5/7:x=18/7-11/7`
`=>5/7:x=1`
`=>x=5/7`
`c)(-1,2).(-3/24)+(0,4-1 4/15):1 2/3`
`=(-6/5).(-1/8)+(2/5-19/15):5/3`
`=3/20+(-13/15)*3/5`
`=3/20-13/25=-37/100`
a)5/8.x+2/5=1/5
5/8.x=1/5 - 2/5
5/8.x=-1/5
x=(-1/5):5/8
x=(-1/5).8/5
x=-8/25. Vậy x=-8/25
b)5/7:x +11/7=18/7
5/7:x=1
x=5/7:1
x=5/7. Vậy x=5/7
Bài 1:
a) \(x.\dfrac{3}{4}=\dfrac{9}{14}\)
\(\Rightarrow x=\dfrac{9}{14}:\dfrac{3}{4}\)
\(\Rightarrow x=\dfrac{6}{7}\)
b) \(x:\dfrac{5}{9}=\dfrac{3}{10}\)
\(\Rightarrow x=\dfrac{3}{10}.\dfrac{5}{9}\)
\(\Rightarrow x=\dfrac{1}{6}\)
\(a/\frac{7}{9}-\frac{x}{3}=\frac{1}{9}\)
\(\Rightarrow\frac{x}{3}=\frac{7}{9}-\frac{1}{9}\)
\(\Rightarrow\frac{x}{3}=\frac{2}{3}\)
\(\Rightarrow x=2\)
Vậy \(x=2\)
\(b/\frac{1}{x}-\frac{-2}{15}=\frac{7}{15}\)
\(\Rightarrow\frac{1}{x}=\frac{7}{15}+\frac{-2}{15}\)
\(\Rightarrow\frac{1}{x}=\frac{1}{3}\)
\(\Rightarrow x=3\)
Vậy \(x=3\)
\(c/\frac{-11}{14}-\frac{-4}{x}=\frac{-3}{14}\)
\(\Rightarrow\frac{-4}{x}=\frac{-11}{14}-\frac{-3}{14}\)
\(\Rightarrow\frac{-4}{x}=\frac{-4}{7}\)
\(\Rightarrow x=7\)
Vậy \(x=7\)
\(d/\frac{x}{21}-\frac{2}{3}=\frac{5}{21}\)
\(\Rightarrow\frac{x}{21}=\frac{5}{21}+\frac{2}{3}\)
\(\Rightarrow\frac{x}{21}=\frac{19}{21}\)
\(\Rightarrow x=19\)
Vậy \(x=19\)
#Mạt Mạt#
bai2
UCLN (n,n+2)=d
=>(n+2)-n chia hết cho d
2 chia het cho d
vay d thuoc uoc cua 2={1,2}
nếu n chia hết cho 2 uoc chung lon nhta (n,n+2) la 2
neu n ko chia het cho 2=> (n,n+2) nguyen to cung nhau
BCNN =n.(n+2) neu n le
BCNN=n.(n+2)/2
a) /x/ =3+5
/x/=8
x= 8 hoặc x=-8
b) \(\Rightarrow\)/x-1/+6=-15
/x-1/=-21
\(\Leftrightarrow\)x-1=-21 hoặc 1-x=-21
x=-20 hoặc x=22
Vậy x= -20 ; x=22
c)\(\Rightarrow\)3./x-2/= -18
/x-2/= -6
x-2=-6 hoặc 2-x=-6
x=-4 hoặc x=8
Vậy x= -4 , x=8
a) \(\Leftrightarrow\left|x\right|=3+5\)
\(\Leftrightarrow\left|x\right|=8\)
\(\Leftrightarrow x=\hept{\begin{cases}8\\-8\end{cases}}\)
a) 27 : x -\(\frac{1}{2}=\frac{15}{7}:5\)
27 : x -\(\frac{1}{2}\)= \(\frac{3}{7}\)
27 : x = \(\frac{3}{7}+\frac{1}{2}\)
27 : x =\(\frac{6}{14}+\frac{7}{14}\)
27 : x = \(\frac{13}{14}\)
x = 27 : \(\frac{13}{14}\)
x = 27 . \(\frac{14}{13}\)
x = \(\frac{378}{13}\)
b) 2 . x - \(\frac{3}{4}\)= \(\frac{15}{9}.\frac{3}{5}\)
2 . x - \(\frac{3}{4}\)= 1
2 . x = 1 + \(\frac{3}{4}\)
2 . x = \(\frac{7}{4}\)
x = \(\frac{7}{4}:2\)
x = \(\frac{7}{8}\)
cho mình đúng nha
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