2019年春八年级数学下册第十九章一次函数第41课时一次函数与一元一次方程(课时小测本)课件(新版)新人教版.ppt

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1、第十九章 一次函数,第41课时 一次函数与一元一次方程,课前学习任务单,x=-10,-10,课前学习任务单,y=kx+b(k0),0,x,横,课前学习任务单,解:(1)-3x+6=0,x=2. (2)x+2=0,x=-2.,课前学习任务单,B,课前学习任务单,x=0,x=1,(3,0),(0,6),略,课堂小测,非线性循环练 1. (10分) 以下列长度为三边构成的三角形中,不是直角三角形的是 ( ) A.2,3,4 B.5,12,13 C.6,8,10 D.7,24,25 2. (10分) 在 ABCD中,ABCD的值可以是( ) A. 4334 B. 7557 C. 4321 D. 757

2、5,A,D,3. (10分) 一次函数y=4x+12的图象向下平移3个单位长度,则平移后的函数解析式为_. 4. (20分) 已知直线y=-2x4与x轴交于点A ,与y轴交于点B,求AOB的面积.,y=4x+9,当堂高效测 1. (10分) 直线y=kx+3与x轴的交点是(1,0),则kx+3=0的解是 ( ) A.x=3 B.x=1 C.x=-2 D.x=-3 2.(10分) 一次函数y=kx+b的图象如图X19-41-3,则由图象可知,关于x的方程kx+b=0的 解为_.,B,x=-2,3. (10分) 直线y=3x9与x轴的交点是_. 4.(20分) 一次函数y=kx+b的图象与y轴相交于点(0,-3),且方程kx+b=0的解为x=2,求这个一次函数的解析式.,(-3,0),

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