Đáp án+Giải thích các bước giải:
`a,(2x-1)/(x-2)=1/2(x ne 2)`
`<=>2(2x-1)=x-2`
`<=>4x-2=x-2`
`<=>3x=0`
`<=>x=0`
`b,(3x+7)/(2x-1)=-2/3(x ne 1/2)`
`<=>3(3x+7)=-2(2x-1)`
`<=>9x+21=-6x+2`
`<=>15x=-19`
`<=>x=-19/15`
`c,(x+2)/(x-3)-2/5=1(x ne 3)`
`<=>(5x+10-2x+6)/(5x-15)=1`
`<=>(3x+16)/(5x-15)=1`
`<=>3x+16=5x-15`
`<=>2x=31`
`<=>x=31/2`
`d,(2(2x-1))/(x+1)=2/7(x ne -1)`
`<=>(2x-1)/(x+1)=1/7`
`<=>7(2x-1)=x+1`
`<=>14x-7=x+1`
`<=>13x=8`
`<=>x=8/13`
