版选修2_2.ppt

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1、1.5.1 曲边梯形的面积1.5.2 汽车行驶的路程,1连续函数 如果函数yf(x)在某个区间I上的图象是一条连续不断的曲线,那么就把它称为区间I上的_函数 2曲边梯形的面积 (1)曲边梯形:由直线xa、xb(ab)、y0和曲线_所围成的图形称为曲边梯形(如图),连续,yf(x),(2)求曲边梯形面积的方法与步骤: 分割:把区间a,b分成许多小区间,进而把曲边梯形拆分为一些_(如图);,小曲边梯形,近似代替:对每个小曲边梯形“_”,即用_的面积近似代替小曲边梯形的面积,得到每个小曲边梯形面积的_(如图); 求和:把以近似代替得到的每个小曲边梯形面积的近似值_; 取极限:当小曲边梯形的个数趋向无

2、穷时,各小曲边梯,以直代曲,矩形,近似值,求和,形的面积之和趋向一个_,即为曲边梯形的面积 3求变速直线运动的路程 如果物体做变速直线运动,速度函数为vv(t),那么也可以采用_、_、_、_的方法,求出它在atb内所作的位移s.,定值,分割,近似代替,求和,取极限,D,D,C,命题方向1 求曲边梯形的面积,命题方向2 求变速运动的路程,规律总结 求变速直线运动的路程问题,方法和步骤类似于求曲边梯形的面积,仍然利用以直代曲的思想,将变速直线运动问题转化为匀速直线运动问题,求解过程为:分割、近似代替、求和、取极限,学科核心素养 利用定积分定义求变力做的功,A与f(x)和区间a,b有关,与分点的个数n和i的取法无关 B与f(x),区间a,b和分点的个数n有关,与i的取法无关 C与f(x),区间a,b和分点的个数n,i的取法都有关 D与f(x),区间a,b和i取法有关,与分点的个数n无关,【答案】C,0.33,

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