Giải thích các bước giải:
`a, 6/7-1/2x=3/4`
⇒`24-14x=21`
⇒`x=3/14`
`b,5+2/5:x=-3/7`
⇒`5+2/(2x)=-3/7`
⇒`2/(5x)=-38/7`
⇒`14=-190x`
⇒`x=-7/95`
`c,(2/3+x)^2=(-1/2)^3.-4/5`
⇒`(2/3+x)^2=1/10`
⇒`x=±√10/10-2/3`
`d, (5/6+x)^3=(-2/3)^3`
⇒`5/6+x=2/3`
⇒`x=-3/2`
`e, (5/8x+1)^3=-8/125`
⇒`(5/8x+1)^3=(-2/5)^3`
⇒`25x+40=-16`
⇒`x=-56/25`
`f, |x-3/10|+-2/5=1/6`
⇒`|x-3/10|=17/30`
⇒`x=13/15` hoặc `x=-4/15`
`g, 1/(1.4)+1/(4.7)+...+1/(x+(x+3))=34/103`
⇒`1/3(1-1/4+1/4-1/7+...+1/x-1/(x+3))=34/103`
⇒`1/3(1-1/(x+3))=34/103`
⇒`1-1/(x+3)=102/103`
⇒`x=100`
