Toán Lớp 7: x² = 4/9 . vậy x=
A.16/81 B.16/81 hoặc -16/81 C.2/3 hoặc -2/3 D.2/3
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Toán Lớp 7: x² = 4/9 . vậy x=
A.16/81 B.16/81 hoặc -16/81 C.2/3 hoặc -2/3 D.2/3
Comments ( 2 )
x^2=4/9
<=>x=\sqrt(4/9)
<=>x=2/3 hoặc x=-2/3
->C
x^2 = 4/9
<=> x = (± 2/3 )^2
$\text{ Vậy chọn đáp án C nha !! }$