Đáp án+Giải thích các bước giải:
Bài 3:
`a) x-17/36=-15/16. 4/27`$\\$`x-17/36=-5/36`$\\$`x=-5/36+ 17/36`$\\$`x=1/3`
`b)4/15-x=-16/25. 5/64`$\\$`4/15-x=-1/20`$\\$`x=4/15 - (-1/20)`$\\$`x=19/60`
`c)|x-2|=(-9)/12.(-4)/3`$\\$`|x-2|=1`$\\$\(<=> \left[ \begin{array}{l}x-2=1\\x-2=-1\end{array} \right.<=>\) \(\left[ \begin{array}{l}x=1+2\\x=-1+2\end{array} \right.<=>\) \(\left[ \begin{array}{l}x=3\\x=1\end{array} \right.\)
`d)x-3^2/25=((-4)/5)^2`$\\$`x-9/25=16/25`$\\$`x=16/25+9/25`$\\$`x=1`
Bài 4:
`a)(x+1,5):3 1/5=(-5)/8`$\\$`(x+3/2):16/5=(-5)/8`$\\$`x+3/2=(-5)/8. 16/5`$\\$`x+3/2=-2`$\\$`x=-2-3/2`$\\$`x=-7/2`
`b)(8 4/5x-50):0,4=51`$\\$`44/5x-50=51.0,4`$\\$`44/5x-50=102/5`$\\$`44/5x=102/5 +50`$\\$`44/5x=352/5`$\\$`x=352/5: 44/5`$\\$`x=8`
`c)(x+5/6)2 2/5-1 1/4=35%`$\\$`(x+5/6)2 2/5=35%+1 1/4`$\\$`(x+5/6)12/5=8/5`$\\$`x+5/6=8/5:12/5`$\\$`x+5/6=2/3`$\\$`x=2/3-5/6`$\\$`x=-1/6`
`d)|x-1|-12/16=25%`$\\$`|x-1|=25%+12/16`$\\$`|x-1|=1`$\\$\(<=>\left[ \begin{array}{l}x-1=1\\x-1=-1\end{array} \right.<=>\) \(\left[ \begin{array}{l}x=1+1\\x=-1+1\end{array} \right.<=>\) \(\left[ \begin{array}{l}x=2\\x=0\end{array} \right.\)
