Đáp án:
`↓↓`
Giải thích các bước giải:
`a) x+5=-x+3`
`=> x+x=3-5`
`=> 2x=-2`
`=> x=-1`
`b) 1/2(2x+3)+1/3x=1/2`
`=> x+3/2+1/3x=1/2`
`=> 4/3x+3/2=1/2`
`=> 4/3x=-1`
`=> x=-3/4`
`c) (10x+1)/2-11=0`
`=> (10x+1)/2=11`
`=> 10x+1=22`
`=> 10x=21`
`=> x=2,1`
`d) |(2x+1)/5|.(1/3x-5/4)=0`
`=>` \(\left[ \begin{array}{l}\dfrac{2x+1}{5}=0 \\ \dfrac{1}{3}x-\dfrac{5}{4}=0\end{array} \right.\)
`=>` \(\left[ \begin{array}{l}2x+1=0\\\dfrac{1}{3}x=\dfrac{5}{4}\end{array} \right.\)
`=>` \(\left[ \begin{array}{l}x=-\dfrac{1}{2}\\x=\dfrac{15}{4}\end{array} \right.\)
