Toán Lớp 7: CHO -2/3x= (-1/3) mũ2 thì
A.x= 1/6
B. x=2/27
C.x= -1/6
D. x=-2/27
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Toán Lớp 7: CHO -2/3x= (-1/3) mũ2 thì
A.x= 1/6
B. x=2/27
C.x= -1/6
D. x=-2/27
Comments ( 2 )
\frac{{ – 2}}{3}x = {\left( {\frac{{ – 1}}{3}} \right)^2}\\
\Rightarrow \frac{{ – 2x}}{3} = \frac{1}{9}\\
\Rightarrow \frac{{ – 2x}}{3} \times 3 = \frac{1}{9} \times 3\\
\Rightarrow – 2x = \frac{1}{3}\\
\Rightarrow x = – \frac{1}{6}\\
\Rightarrow C
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