`text{Đáp án + Giải thích các bước giải}`
`text{Ta có:}`
`2.|3x-1|+1=5`
`⇒2.|3x-1|=5-1=4`
`⇒|3x-1|=4:2`
`⇒|3x-1|=2`
`⇒`\(\left[ \begin{array}{l}3x-1=2\\3x-1=-2\end{array} \right.\)
`⇒`\(\left[ \begin{array}{l}x=1\\x=-1/3\end{array} \right.\)
`text{______________________________________________________}`
`text{Ta có:}`
`|x+1/4|-3/4=5%`
`⇒|x+1/4|-3/4=1/20`
`⇒|x+1/4|=1/20+3/4=4/5`
`⇒`\(\left[ \begin{array}{l}x+1/4=4/5\\x+1/4=-4/5\end{array} \right.\)
`⇒`\(\left[ \begin{array}{l}x=4/5-1/4\\x=-4/5-1/4\end{array} \right.\)
`⇒` \(\left[ \begin{array}{l}x=11/20\\x=-21/20\end{array} \right.\)
`text{__________________________________________}`
`text{Ta có:}`
`6,5-9/4:|x+1/3|=2`
`⇒9/4:|x+1/3|=6,5-2=4,5`
`⇒|x+1/3|=9/4:4/5=45/16`
`⇒`\(\left[ \begin{array}{l}x+1/3=45/16\\x+1/3=-45/16\end{array} \right.\)
`⇒`\(\left[ \begin{array}{l}x=119/48\\x=-151/48\end{array} \right.\)
`text{_______________________________________}`
`text{Ta có:}`
`3/2+4/5.|x-3/4|=7/4`
`⇒4/5.|x-3/4|=7/4-3/2=1/4`
`⇒|x-3/4|=1/4:4/5=5/16`
`⇒`\(\left[ \begin{array}{l}x-3/4=5/16\\x-3/4=-5/16\end{array} \right.\)
`⇒`\(\left[ \begin{array}{l}x=17/16\\x=7/16\end{array} \right.\)
XIN HAY NHẤT.
KO SAO CHÉP.
MONG MOD KO XÓA.
