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\(a,x=\dfrac{1}{5}+\dfrac{-3}{7}\)
\(x=\dfrac{7}{35}+\dfrac{-15}{35}\)
\(x=-\dfrac{8}{35}\)
\(b,\dfrac{3}{5}-\dfrac{4}{7}:x=\dfrac{-9}{10}\)
\(\dfrac{4}{7}:x=\dfrac{3}{5}-\dfrac{-9}{10}\)
\(\dfrac{4}{7}:x=\dfrac{3}{2}\)
\(x=\dfrac{4}{7}:\dfrac{3}{2}\)
\(x=\dfrac{4}{7}\times\dfrac{2}{3}\)
\(x=\dfrac{8}{21}\)
\(c,x-\left(\dfrac{-3}{4}\right)=\dfrac{-2}{3}-\dfrac{1}{2}\)
\(x+\dfrac{3}{4}=\dfrac{-4}{6}-\dfrac{3}{6}\)
\(x+\dfrac{3}{4}=-\dfrac{7}{6}\)
\(x=-\dfrac{7}{6}-\dfrac{3}{4}\)
\(x=-\dfrac{23}{12}\)
\(d,\dfrac{-5}{9}-x=\dfrac{1}{3}+\dfrac{7}{18}\)
\(\dfrac{-5}{9}-x=\dfrac{6}{18}+\dfrac{7}{18}\)
\(\dfrac{-5}{9}-x=\dfrac{13}{18}\)
\(x=\dfrac{-5}{9}-\dfrac{13}{18}\)
\(x=\dfrac{-10}{18}-\dfrac{13}{18}\)
\(x=-\dfrac{23}{18}\)
a ) x = 1 ; x = 0
b ) x = 1 ; x = 0
c ) x không có ; x không tồn tại
d ) x không có ; x không tồn tại
a,x2.x3=25
=>x5=25
=>x=2
b,x+18=5.4^2
=>x=5.16-18
=>x=62
c,x.(x^2)^3=x^5
=>x.x5=x5
=>x=0,1
d,2x.7=224
2x=32
=>2x=25
=>x=5
e,(3x+5)2=289
=>(3x+5)2=172
=>3x+5=17
=>3x=12
=>x=4
g,32x+1.11=2673
=>32x=243
=>32x=35
=>x=\(\frac{5}{2}\)
B)
( x + 4/3 ) * 7/4 = 5 - 7/6
( x + 4/3) * 7/4 = 5/1 - 7/6
( x + 4/3) * 7/4 = 30/6 - 7/6
( x + 4/3) * 7/4 = 23/6
( x + 4/3) = 23/6 : 7/4
( x+ 4/3) = 23/6 . 4/7
( x+ 4/3) = 46/21
x = 46/21 - 4/3
x = 46/21 - 28/21
x = 18/21 = 6/7
Tk vs kb hộ mk nha! thank u
may cau khac ko kho lam dau chi co cau d thoi.
(100%-50%+40%):x=18%+30%:x
90%:x=18%+30%:x
18%=90%:x-30%:x
18%=60%:x
X=60%:18%
x=..................................................................................................
xong roi do a cho minh nhe
a, \(x-\frac{8}{9}=\frac{1}{3}\)
\(\Leftrightarrow x=\frac{1}{3}+\frac{8}{9}\)
\(\Leftrightarrow x=\frac{11}{9}\)
b, \(\frac{-4}{5}-\frac{8}{15}=\frac{-1}{3}-x\)
\(\Leftrightarrow\frac{-4}{3}=\frac{-1}{3}-x\)
\(\Leftrightarrow x=1\)
c, \(x+\frac{4}{5.9}+\frac{4}{9.13}+...+\frac{4}{41.45}=\frac{-37}{45}\)
Đặt \(A=\frac{4}{5.9}+\frac{4}{9.13}+...+\frac{4}{41.45}\)
\(A=\frac{1}{5}-\frac{1}{9}+\frac{1}{9}-\frac{1}{13}+...+\frac{1}{41}-\frac{1}{45}\)
\(A=\frac{1}{5}-\frac{1}{45}=\frac{8}{45}\)
Thay A vào phép tính
\(\Rightarrow x+\frac{8}{45}=\frac{-37}{45}\)
\(\Rightarrow x=-1\)
1) 4x-(2x-5)=21
4x-2x+5=21
2x+5=21
2x=21 -5
2x=16
x=16/2
x=8
\(a,x-\dfrac{1}{18}=\dfrac{-4}{15}\\ \Rightarrow x=\dfrac{-4}{15}+\dfrac{1}{18}\\ \Rightarrow x=\dfrac{-19}{90}\)
\(b,2x+\dfrac{3}{4}=x-\dfrac{1}{3}\\ \Leftrightarrow2x-x=-\dfrac{1}{3}-\dfrac{3}{4}\\ \Leftrightarrow x=\dfrac{-4-9}{12}\\ \Leftrightarrow x=-\dfrac{13}{12}\)
\(c,\dfrac{x-3}{5}=\dfrac{5}{x-3}\\ \Leftrightarrow\left(x-3\right)^2=25\\ \Leftrightarrow\left[{}\begin{matrix}x-3=5\\x-3=-5\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=8\\x=-2\end{matrix}\right.\)