Toán Lớp 7: Nếu x thuộc Q, ta có
A./x/>0
b./x/=-x
c./x/=/-x/
d./x/=x
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Toán Lớp 7: Nếu x thuộc Q, ta có
A./x/>0
b./x/=-x
c./x/=/-x/
d./x/=x
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