解一元二次方程练习题(配方法)1.用适当的数填空:①、x2+6x+=(x+)2;②、x2-5x+=(x-)2;③、x2+x+=(x+)2;④、x2-9x+=(x-)22.将一元二次方程x2-2x-4=0用配方法化成(x+a)2=b的形式为_______,所以方程的根为_________.3.若x2+6x+m2是一个完全平方式,则m的值是()A.3B.-3C.±3D.以上都不对4.把方程x2+3=4x配方,得()A.(x-2)2=7B.(x+2)2=21C.(x-2)2=1D.(x+2)2=25.用配方法解方程x2+4x=10的根为()A.2±B.-2±C.-2+D.2-6.用配方法解下列方程:(2)x2+8x=9(3)x2+12x-15=0(4)x2-x-4=07.用直接开平方法解下列一元二次方程。1、2、3、4、8.用配方法解下列一元二次方程。1、.2、3、4、5、6、7.用直接开平方法解下列一元二次方程。1、2、3、4、8.用配方法解下列一元二次方程。1、.2、3、4、5、6、1.x2﹣2x=4.2.3x2=5x+23.2x2﹣4x+1=0.4.x2+2x=2;5.x2﹣2x﹣4=0.6..7.x2+4x﹣1=0.8.2x2+x﹣30=09.x2﹣28x﹣4=010.x2﹣8x﹣1=0.11.x2+2x=5.12.2x2+6=7x13.2x2+1=8x14.3x2﹣2x﹣6=015..16.x2+2x﹣15=0.17.x2+6x﹣16=018.2x2﹣5x﹣3=019.x2﹣4x+2=020.(x+3)(x﹣1)=1221.2x2﹣12x+6=022.2x2﹣3x﹣2=0.23.x(x+2)﹣5=0.24.x2﹣6x+2=025.3x2﹣6x﹣1=026.2x2+4x﹣1=027.x2﹣4x+3=0.28.x2﹣6x﹣3=029.2x2﹣8x+3=0.30.3x2﹣4x+1=0;31.x2﹣6x+1=0.32.2x2﹣4x+1=033.x2+5x﹣3=0.34.x2+2x﹣4=035.2x2﹣4x+1=0.36..37.5(x2+17)=6(x2+2x)38.4x2﹣8x+1=039.2x2+1=3x.40.x2+x﹣2=0.41.x2﹣6x+1=042.x2﹣8x+5=043.x2+3x﹣4=0.44.3x2+8x﹣3=045.x2+8x=2.46.x2+3x+1=047.2x2﹣3x+1=048.x2﹣4x﹣6=049.x2﹣8x+1=050.x2+4x+1=051.x2﹣4x+1=052.x2﹣6x﹣7=053.x2﹣6x﹣5=0.54.2x2+1=3x56.x2+3x+1=057.x2﹣8x+1=0.58.x2﹣8x﹣16=059..60.6x2﹣7x﹣3=061.x2﹣6x=﹣8;62.2x2﹣5x+1=0.63.3x2+8x﹣3=064.3x2﹣4x+1=065.2x2+3x﹣1=0.66.2x2﹣5x﹣1=067.4x2﹣8x﹣1=068.3x2+4x﹣7=069.3x2﹣10x=﹣6.70.3x2﹣10x﹣5=071.2x2+3=7x72.x2+2x﹣224=073.x2﹣5x﹣14=074..75.x2+8x﹣20=076.x2﹣x+.77.2t2﹣6t+3=0.78.3x2﹣6x﹣12=0.79.x2﹣4x+1=080.3x2﹣3=2x.81.2x2﹣5x+1=0.82.2y2+8y﹣1=083.x2﹣6x﹣18=084.x2﹣2x﹣1=0.85.x2﹣4x﹣1=0;86.2x2+3x+1=0.87.2x2﹣6x﹣7=088.ax2+bx+c=0(a≠0).89.4x2﹣4ax+a2﹣b2=0.90.x2﹣4x﹣2=091.x(x+4)=6x+1292.2x2+7x﹣4=093.3(x﹣1)(x+2)=x+494.3x2﹣6x=895.2x2﹣x﹣30=0,96.x2+2=2x,97.x2+px+q=O(p2﹣4q≥O)98.m2x2﹣28=3mx(m≠O),99.x2﹣6x+7=0;100.2x2+6=7x;101.﹣5x2+10x+15=0.102.x2+6x+8=0;103.x2=6x+16;104.2x2+3=7x;105.(2x﹣1)(x+3)=4.106.x2+4x=﹣3;107.2x2+x=0.108.x2+4x﹣3=0;109.x2+3x2=0﹣;