Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
nhân chéo là đc:
3(x+2)=-4(x-5)
3x+6=-4x+20
3x+4x=20-6
7x =14
x =2
Vậy x=2
a) 4/3 - x = 3/5 + 1/2
=> 4/3 - x= 0,8
=> x = 4/3 + 0/8
=> x = 5/8
\(\frac{x-2}{27}+\frac{x-3}{26}+\frac{x-4}{25}+\frac{x-5}{24}+\frac{x-44}{5}=1\)
\(\Leftrightarrow\left(\frac{x-2}{27}-1\right)+\left(\frac{x-3}{26}-1\right)+\left(\frac{x-4}{25}-1\right)+\left(\frac{x-5}{24}-1\right)\)\(+\left(\frac{x-44}{5}+3\right)=1-1\)
\(\Leftrightarrow\frac{x-29}{27}+\frac{x-29}{26}+\frac{x-29}{25}+\frac{x-29}{24}\)\(+\frac{x-29}{5}=0\)
\(\Leftrightarrow\left(x-29\right)\left(\frac{1}{27}+\frac{1}{26}+\frac{1}{25}+\frac{1}{24}+\frac{1}{5}\right)=0\)
Mà \(\frac{1}{27}+\frac{1}{26}+\frac{1}{25}+\frac{1}{24}+\frac{1}{5}\ne0\)
=> x - 29 = 0
=> x = 29.
\(50\%x+\frac{2}{3}x=x-5\)
\(\Rightarrow\frac{1}{2}x+\frac{2}{3}x=x-5\)
\(\Rightarrow x\left(\frac{1}{2}+\frac{2}{3}\right)=x-5\)
\(\Rightarrow x.\frac{7}{6}=x-5\)
\(\Rightarrow x-\frac{7}{6}x=5\)
\(\Rightarrow\frac{-x}{6}=5\Leftrightarrow-x=30\Leftrightarrow x=-30\)
\(50\%x+\frac{2}{3}x=x-5\)
\(\frac{1}{2}x+\frac{2}{3}x=x-5\)
\(x\left(\frac{1}{2}+\frac{2}{3}\right)=x-5\)
\(x.\frac{7}{6}=x-5\)
\(x.\frac{7}{6}-x=-5\)
\(x.\frac{1}{6}=-5\)
\(x=\left(-5\right):\frac{1}{6}=-30\)
Vậy x= -30
Ta có :
\(x.8=6.5\)
=> \(x=6.5:8\)
\(x=30:8=\frac{15}{4}\)
\(\frac{3-x}{5-x}=\left(\frac{3}{5}\right)^2\)
\(\Rightarrow\frac{3-x}{5-x}=\frac{9}{25}\)
\(\Rightarrow\left(3-x\right)25=9\left(5-x\right)\)
\(\Rightarrow75-25x=45-9x\)
\(\Rightarrow-25x+9x=45-75\)
\(\Rightarrow-16x=-30\)
\(\Rightarrow x=\frac{15}{8}\)
cảm ơn bạn nha