2009年广东省梅州市中考数学试题及答案(word版)(2)

1

解：2) 4cos30° |．

3

1

1 3 42······································································································ 4分

4 ················································································································ 6分 3 4 ······································································································································ 7分

17．本题满分 7 分．

解：由x 1≥1 x得x≥1， ······························································································ 2分 由x 8 4x 1，得x 3． ······························································································ 4 分 所以不等式组的解为：1≤x 3， ···················································································· 6 分 所以不等式组的整数解为：1，2． ······················································································· 7 分 18．本题满分 8 分．

x2 4x2 x(x 2)(x 2)x(x 1)

x x ·解：2············································ 3分

x 4x 4x 1(x 2)2x 1

x 2

1 x 2

2x

··································································································································· 6分 x 2

32 3 6． ·当x 时，原式 ··································&