Đáp án:+Giải thích các bước giải:
`1`
`a)2/3+1/3-2/5`
`=3/3-2/5`
`=1-2/5`
`=3/5`
`b)10/11.(1)/3-17/18.(10)/11`
`=10/11(1/3-17/18)`
`=10/11.(-11/18)`
`=-10/18`
`=-5/9`
`c)6/5:2/5-10:1/2`
`=6/5.5/2-10.2`
`=3-20`
`=-17`
`2`
`a)x+1/2=3/4-(-1/2)`
`<=>x=3/4+1/2-1/2`
`<=>x=3/4`
`b)4/7-2x=1`
`<=>2x=4/7-1`
`<=>2x=-3/7`
`<=>x=-3/14`
`c)|x|-2 1/3=1/6`
`<=>|x|=1/6+7/3`
`<=>|x|=15/6`
`<=>|x|=5/2`
`<=>`\(\left[ \begin{array}{l}x=\dfrac{5}{2}\\x=\dfrac{-5}{2}\end{array} \right.\)
