2018_2019学年八年级数学下册第一部分基础知识篇第3课一元二次方程及解法(A组)夯实基础课件(新版)浙教版.ppt

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解题技巧,1. 一元二次方程x(x-2)=2-x的根是( ),A. -1 B. 0 C. 1和2 D. -1和2,x(x-2)=2-x,(x-2)(x+1)=0,x-2=0 或 x+1=0,故选D,解题技巧,B. C. D.,所以m3,0 3,0 3,0 3,0 3,故选B,解题技巧,没有实数根 B.有一个实数根 C.有两个不相等的实数根 D. 有两个相等的实数根,所以k-10,解得k1,又一元二次方程=4-4k,所以方程无实数根。,故选A.,所以0,解题技巧,又因为a0,等式两边同除以a得,,a-b+1=0,即a-b=-1,故选D,解题技巧,解得:k-1,k的最小整数值为1,故答案:1,k0,解题技巧,(x-5)(x-8)=0,而三角形的两边长是3和4,根据三角形的 三边关系可知,三角形的第三边的长为5,所以三角形的周长为3+4+5=12,故答案:12,解题技巧,解题技巧,(1)原方程有两个不相等的实数根,解题技巧,k只能是2,

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