Đáp án:
↓↓
Giải thích các bước giải:
`a)`
`(x-45)=416-387`
`x-45=29`
`x=29+45`
`x=74`
`b)`
`(x+84)=11-97`
`x+84=-86`
`x=-86-84`
`x=-170`
`c)`
`-(x+84)=-16-213`
`-(x+84)=-229`
`-x-84=-229`
`-x=-229+84`
`-x=-145`
`x=145`
`d)`
`x=18-(-35)`
`x=18+35`
`x=53`
`e)`
`(2x-5)=6-17`
`(2x-5)=-11`
`2x=-11+5`
`2x=-6`
`x=-6÷2`
`x=-3`
`f)`
`-2x=15+(-17)`
`-2x=-2`
`x=-2÷(-2)`
`x=-1`
`g)`
`5x=50+10`
`5x=60`
`x=60÷5`
`x=12`
`h)`
`x-1=0`
`x=1`
`i)`
`x=-12+7`
`x=-5`
`j)`
`|1+x|=5-3`
`|1-x|=2`
\(\left[ \begin{array}{l}1-x=2\\1-x=-2\end{array} \right.\)
\(\left[ \begin{array}{l}x=1-2\\x=1-(-2)\end{array} \right.\)
\(\left[ \begin{array}{l}x=3\\x=-1\end{array} \right.\)
`k)`
\(\left[ \begin{array}{l}x=5\\x=-5\end{array} \right.\)
`i)`
`3x-5=-7+-13`
`3x-5=-20`
`3x=-20+5`
`3x=-15`
`x=-15÷3`
`x=-5`
`m)`
`|x|=-3+10`
`|x|=7`
\(\left[ \begin{array}{l}x=7\\x=-7\end{array} \right.\)
`n)`
\(\left[ \begin{array}{l}x-1=1\\x-1=-1\end{array} \right.\)
\(\left[ \begin{array}{l}x=1+1\\x=-1+1\end{array} \right.\)
\(\left[ \begin{array}{l}x=2\\x=0\end{array} \right.\)
`o)`
Sai đề.
