18 若 x = -3x + 2 是 ax + 3x + bx - 2 的因式,則 a + 3b 之值等於下列何者? ... ( A ) cos2x + 2sinx = 1 ( B ) tan'x - sin ? x = tan'xsin'x ( C ) cotox - cos2x ...
確定! 回上一頁