题目205 m线 =cos x(xin [ 0,dfrac (pi )(2)] ) 与x轴,y轴所围面积被曲线 =asin x 等分,则 a=-|||-(A) dfrac (2)(5) (B) dfrac (3)(5). (C) 3/4 (D) dfrac (1)(2)A、AB、BC、CD、DA、AB、BC、CD、D题目解答答案C