Giải thích các bước giải:
a,`x-1/2=-2/3`
=>`x=(-2/3)+1/2`
=>`x=(-4/6)+3/6`
=>`x=-1/6`
Vậy `x=-1/6`
b,`|x|=3/7`
TH1:`x=3/7`
TH2`x=-3/7`
Vậy `x={3/7;-3/7}`
`x - 1/2 = -2/3``x = -2/3 + 1/2``x = -4/6 + 3/6``x = -1/6`
`|x | = 3/7`
⇒ \(\left[ \begin{array}{l}x=\frac{3}{7}\\x=-\frac{3}{7}\end{array} \right.\)
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Giải hệ phương trình x^3+2=3y y^3+2=3x
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