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2023年高考数学二轮复习(新高考版)第2部分考前回扣 回扣8 函数与导数_2.2025数学总复习_2023年新高考资料_二轮复习_2023年高考数学二轮复习讲义+课件(新高考版)

  • 2026-03-10 04:12:58 2026-03-10 04:12:58

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2023年高考数学二轮复习(新高考版)第2部分考前回扣 回扣8 函数与导数_2.2025数学总复习_2023年新高考资料_二轮复习_2023年高考数学二轮复习讲义+课件(新高考版)
2023年高考数学二轮复习(新高考版)第2部分考前回扣 回扣8 函数与导数_2.2025数学总复习_2023年新高考资料_二轮复习_2023年高考数学二轮复习讲义+课件(新高考版)
2023年高考数学二轮复习(新高考版)第2部分考前回扣 回扣8 函数与导数_2.2025数学总复习_2023年新高考资料_二轮复习_2023年高考数学二轮复习讲义+课件(新高考版)

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回扣 8 函数与导数 1.函数的定义域和值域 (1)求函数定义域的类型和相应方法 若已知函数的解析式,则函数的定义域是使解析式有意义的自变量的取值范围. (2)常见函数的值域 ①一次函数y=kx+b(k≠0)的值域为R; ②二次函数y=ax2+bx+c(a≠0):当a>0时,值域为,当a<0时,值域为; ③反比例函数y=(k≠0)的值域为{y∈R|y≠0}. 2.函数的奇偶性、周期性 (1)奇偶性是函数在其定义域上的整体性质,对于定义域内的任意 x(定义域关于原点对称), 都有f(-x)= - f ( x )成立,则f(x)为奇函数(都有f(-x)= f ( x ) 成立,则f(x)为偶函数). (2)周期性是函数在其定义域上的整体性质,一般地,对于函数f(x),如果对于定义域内的任 意一个x的值,若 f ( x + T ) = f ( x )( T ≠ 0) ,则f(x)是周期函数,T是它的一个周期. 3.关于函数周期性、对称性的结论 (1)函数的周期性 ①若函数f(x)满足f(x+a)=f(x-a),则f(x)为周期函数, 2 a 是它的一个周期; ②若函数f(x)满足f(x+a)=,则f(x)为周期函数, 2 a 是它的一个周期; ③若函数f(x)满足f(x+a)=-f(x),则f(x)为周期函数, 2 a 是它的一个周期. (2)函数图象的对称性 ①若函数y=f(x)满足f(a+x)=f(b-x), 则函数f(x)的图象关于直线x=对称. ②若函数y=f(x)满足f(a+x)=-f(b-x), 则函数f(x)的图象关于点对称. 4.函数的单调性 函数的单调性是函数在其定义域上的局部性质. (1)单调性的定义的等价形式:设任意x,x∈[a,b],且x≠x, 1 2 1 2 那么(x-x)[f(x)-f(x)]>0⇔>0⇔f(x)在[a,b]上单调递增; 1 2 1 2 (x-x)[f(x)-f(x)]<0⇔<0⇔f(x)在[a,b]上单调递减. 1 2 1 2 (2)若函数f(x)和g(x)都是减函数,则在公共定义域内,f(x)+g(x)是减函数;若函数f(x)和g(x) 都是增函数,则在公共定义域内,f(x)+g(x)是增函数;根据同增异减判断复合函数 y= f(g(x))的单调性. 5.指数函数与对数函数的基本性质(1)定点:y=ax(a>0,且a≠1)恒过(0,1)点; y=log x(a>0,且a≠1)恒过(1,0)点. a (2)单调性:当a>1时,y=ax在R上单调递增;y=log x在(0,+∞)上单调递增; a 当00的解集确定函数f(x)的单调递增区间,由f′(x)<0的解集确定函数f(x)的单调递 减区间. (2)由函数的单调性求参数的取值范围 ①若可导函数f(x)在区间M上单调递增,则f′(x)≥0(x∈M)恒成立;若可导函数f(x)在区间 M上单调递减,则f′(x)≤0(x∈M)恒成立; ②若可导函数在某区间上存在单调递增(减)区间,f′(x)>0(或f′(x)<0)在该区间上存在解集; ③若已知f(x)在区间I上的单调性,区间I中含有参数时,可先求出f(x)的单调区间,则I是 其单调区间的子集. 9.利用导数研究函数的极值与最值 (1)求函数的极值的一般步骤 ①确定函数的定义域; ②解方程f′(x)=0; ③判断f′(x)在方程f′(x)=0的根x 附近两侧的符号变化: 0 若左正右负,则x 为极大值点; 0 若左负右正,则x 为极小值点; 0若不变号,则x 不是极值点. 0 (2)求函数f(x)在区间[a,b]上的最值的一般步骤 ①求函数y=f(x)在区间(a,b)内的极值; ②比较函数y=f(x)的各极值与端点处的函数值f(a),f(b)的大小,最大的一个是最大值,最 小的一个是最小值. 10.常见的含有导数的几种不等式构造原函数类型 (1)对于f′(x)±g′(x)>0,构造函数h(x)=f(x)±g(x). (2)对于f′(x)g(x)+f(x)g′(x)>0,构造函数h(x)=f(x)g(x). (3)对于f′(x)g(x)-f(x)g′(x)>0,构造函数h(x)=(g(x)≠0). 例如,对于xf′(x)+f(x)>0,构造函数h(x)=xf(x), 对于xf′(x)-f(x)>0,构造函数h(x)=. 对于f(x)+f′(x)>0,构造函数h(x)=exf(x), 对于f′(x)-f(x)>0,构造函数h(x)=. 1.解决函数问题时要注意函数的定义域,要树立定义域优先原则. 2.解决分段函数问题时,要注意与解析式对应的自变量的取值范围. 3.求函数单调区间时,多个单调区间之间不能用符号“∪”和“或”连接,可用“和”连 接或用“,”隔开.单调区间必须是“区间”,而不能用集合或不等式代替. 4.判断函数的奇偶性,要注意定义域必须关于原点对称,有时还要对函数式化简整理,但 必须注意使定义域不受影响. 5.准确理解基本初等函数的定义和性质.如函数 y=ax(a>0,a≠1)的单调性容易忽视对a 的取值进行讨论;对数函数y=log x(a>0,a≠1)容易忽视真数与底数的限制条件. a 6.易混淆函数的零点和函数图象与x轴的交点,不能把函数零点、方程的解、不等式解集 的端点值进行准确互化. 7.已知可导函数f(x)在区间(a,b)上单调递增(减),则f′(x)≥0(≤0)对∀x∈(a,b)恒成立, 不能漏掉“=”,且需验证“=”不能恒成立. 8.f′(x)=0的解不一定是函数f(x)的极值点.一定要检验在x=x 的两侧f′(x)的符号是否 0 发生变化,若变化,则为极值点;若不变化,则不是极值点.
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  1. CONNECT:[ UseTime:0.001020s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001474s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000757s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000682s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001316s ]
  6. SELECT * FROM `set` [ RunTime:0.000615s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001457s ]
  8. SELECT * FROM `wendang` WHERE `id` = 369231 LIMIT 1 [ RunTime:0.001065s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 369231 [ RunTime:0.030855s ]
  10. UPDATE `wendang` SET `lasttime` = 1773087202 WHERE `id` = 369231 [ RunTime:0.006296s ]
  11. SELECT * FROM `wendang` WHERE `id` < 369231 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001169s ]
  12. SELECT * FROM `wendang` WHERE `id` > 369231 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001251s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 369231 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005129s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 369231 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005341s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 369231 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003793s ]
0.248926s