函数y=23x2+3xy=\dfrac{2}{3}x^{2}+3xy=32x2+3x的极值点为( ).
(A)x=−3x=-3x=−3
(B)x=3x = 3x=3
(C)x=−1x=-1x=−1
(D)x=1x = 1x=1
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