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一、选择题 (满分 32分 ,每小题 4分 )1.从 1到 12 0的自然数中 ,能被 3整除或被 5整除的数共有的个数是 ( ) .(Ａ) 6 4个 (Ｂ) 4 8个 (Ｃ) 5 6个 (Ｄ) 4 6个2 .已知 1ｘ =3ｙ +ｚ=5ｚ+ｘ.则 ｘ - 2ｙ2ｙ +ｚ的值为( ) .(Ａ) 1(Ｂ) 32 (Ｃ) - 32 (Ｄ) 143.设方程 2ｘ2 +ａｘ - 2 =0的两根之差的绝对值为 52 .
First, multiple-choice questions (out of 32 points, 4 points for each question) 1. From 1 to 12 0 natural numbers, the number of numbers that can be divisible by 3 or divisible by 5 is () (A) 6 4 (B) 4 8 (C) 5 6 (D) 4 6 2. Known 1x = 3y + z = 5z + x. Then the value of x - 2y2y + z is (). (A) 1 (B ) 32 (C) - 32 (D) 143. Let the absolute value of the difference between the two roots of the equation 2x2 +ax - 2 =0 be 52.