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hg1932com:江苏省宝应县画川高级中学高一数学填空题专项训练(27)(无答案)

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高一数学填空题专项训练(二十七) 1.设 θ 为第二象限角,若 ,则 sinθ +cosθ = ; 2.△ABC 中,∠B=120°,AC=7,AB=5,则△ABC 的面积为 3.在等差数列{ an }中,已知 a3 ? a8 ? 10,则 3 a5 ? a7 = ; ; 4. 设 {an } 是 等 差 数 列 , {bn } 是 各 项 都 为 正 数 的 等 比 数 列 , 且 a1 ? b1 ? 1 , a3 ? b5 ? 21 , a5 ? b3 ? 13 , a n ? ___________; bn ? _________; 5.若 x ? 0 ,则 f ( x) ? x ? 2 1 1 ? x ? 的最小值为____________; 2 x x 6.已知直线 m : 2 x ? y ? 3 ? 0, n : x ? y ? 3 ? 0 ,求过两直线 m, n 交点且与两坐标轴围成面积为 4 的直线 方程 __ ____________; 7.已知两直线 l1:ax-by+4=0,l2:(a-1)x+y+b=0,直线 l1 过点(-3,-1),并且直线 l1 与 l2 垂直 则 a=_______;b=______; 8.已知两直线 l1:mx+8y+n=0 和 l2:2x+my-1=0,当 l1 与 l2 相交于点 P(m,-1)时,m,n 的值分别 为_______、________; 9.已知点 A(5,8), B(4,1) ,则点 A 关于点 B 的对称点 C 的坐标为___________; 10.点(1,-1)到直线 x-y+1=0 的距离是__________; 11.求于直线 3x ? 4 y ? 20 ? 0 平行且距离为 3 的直线方程为_______________; 12.已知直线 l 经过点 P(3,1),且被两平行直线 l1:x+y+1=0 和 l2:x+y+6=0 截得的线段 之长为 5, 求直线 l 的方程______________。 1

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