Đáp án:
Giải thích các bước giải:
a) `3/5+2/5 x=1`
`⇔ 2/5 x=1-3/5`
`⇔ 2/5 x=5/5-3/5`
`⇔ 2/5 x=2/5`
`⇔ x=2/5:2/5`
`⇔ x=1`
Vậy `x=1`
b) `\frac{2x-6}{3}=\frac{x+2}{4}`
`⇔ 3(x+2)=4(2x-6)`
`⇔ 3x+6=8x-24`
`⇔ 8x-3x=24+6`
`⇔ 5x=30`
`⇔ x=6`
Vậy `x=6`
c) `|4x-3|=3/2:9/8`
`⇔ |4x-3|=3/2 . 8/9`
`⇔ |4x-3|=4/3`
`⇔` \(\left[ \begin{array}{l}4x-3=\dfrac{4}{3}\\4x-3=-\dfrac{4}{3}\end{array} \right.\)
`⇔` \(\left[ \begin{array}{l}4x=\dfrac{13}{3}\\4x=\dfrac{5}{3}\end{array} \right.\)
`⇔` \(\left[ \begin{array}{l}x=\dfrac{13}{12}\\x=\dfrac{5}{12}\end{array} \right.\)
Vậy `x=13/12,x=5/12`
