Đáp án:
`a)x=1/5`
`b)x=(-1)/2`
`c)x=1/3` hoặc `x=-2/5`
`d)x=3/4` hoặc `x=2/5`
Giải thích các bước giải:
`a)(-4)/5+5/2x=(-3)/10`
`5/2x=(-3)/10-(-4)/5`
`5/2x=(-3)/10+4/5`
`5/2x=(-3)/10+8/10`
`5/2x=5/10`
`5/2x=1/2`
`x=1/2:5/2`
`x=1/2 . 2/5`
`x=1/5`
`b)4/3+5/8:x=1/12`
`5/8:x=1/12-4/3`
`5/8:x=1/12-16/12`
`5/8:x=(-15)/12`
`5/8:x=(-5)/4`
`x=5/8:(-5)/4`
`x=5/8 . (-4)/5`
`x=-1/2`
`c)(x-1/3).(x+2/5)=0`
`x-1/3=0` hoặc `x+2/5=0`
`x` `=0+1/3` `x` `=0-2/5`
`x` `=1/3` `x` `=-2/5`
`d)(3/4x-9/16).(1/5+(-3)/5:x)=0`
`3/4x-9/16=0` hoặc `1,5+(-3)/5:x=0`
`3/4x` `=0+9/16` `3/2+(-3)/5:x=0`
`3/4x` `=9/16` `(-3)/5:x=0-3/2`
`x` `=9/16:3/4` `(-3)/5:x=(-3)/2`
`x` `=9/16 . 4/3` `x=(-3)/5:(-3)/2`
`x` `=3/4` `x=(-3)/5 . (-2)/3`
`x=2/5`
