Đáp án:
a) `x=13/15`
b)` x=-7/11`
c)` x=3`
d)` x=3;-9/15`
Giải thích các bước giải:
a) `4 1/3: x/4=6:0,3`
`->13/3 . 4/x = 6. 10/3`
`->52/(3x)=20`
`-> 60x=52`
`->x=13/15`
b) `-11/12 .x+0,25=5/6`
`->-11/12 . x=5/6-1/4`
`->-11/12 .x=7/12`
`->x=7/12:(-11/12)`
`->x=-7/11`
c) `(2^3 :4).2^(x+1)=64`
`->(8:4).2^(x+1)=64`
`->2.2^(x+1)=64`
`->2^(x+2)=2^5`
`->x+2=5`
`->x=3`
d) `|3-5x|-3=-(-9)`
`->|3-5x|-3=9`
`->|3-5x|=12`
`->`\(\left[ \begin{array}{l}3-5x=12\\3-5x=-12\end{array} \right.\)
`->` \(\left[ \begin{array}{l}5x=-9\\5x=15\end{array} \right.\)
`->` \(\left[ \begin{array}{l}x=\dfrac{-9}{5}\\x=3\end{array} \right.\)
