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方程4x2-5=0的根为( )
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教案备课库《作业:05122.1一元二次方程》真题及答案
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关于x的方程2x﹣1﹣a=0的根是3则a的值为
4
﹣4
5
﹣5
已知命题p方程x2+mx+1=0有负实数根命题q方程4x2+4m-2x+1=0无实数根若p或q为真命
若关于x的方程x2+3x+a=0有一个根为﹣1则另一个根为
﹣2
2
4
﹣3
将方程x2-2x+1=4-3x化为一般形式为__________其中a=________b=____
关于x的方程2x﹣1﹣a=0的根是3则a的值为
4
﹣4
5
﹣5
若关于x的方程x2+3x+a=0有一个根为1则另一个根为
﹣4
2
4
﹣3
已知关于x的一元二次方程x2+2x+2k﹣4=0有两个不相等的实数根.1求k的取值范围2若k为正整数
方程x-32=x-3的根为
3
4
4或3
-4或3
若关于x的方程+=3有增根则增根一定是.
若方程x2﹣3x﹣1=0的两根也是方程x4+ax2+bx+c=0的根则a+b﹣2c的值为
﹣13
﹣9
6
0
如果关于x的一元二次方程ax2+bx+c=0有两个实数根且其中一个根为另一个根的2倍则称这样的方程为
若关于x的方程x2+3x+a=0有一个根为-1则另一个根为
-2
2
4
-3
请阅读下列材料已知方程x2+x﹣3=0求一个一元二次方程使它的根分别是已知方程根的2倍.解设所求方程
关于x的方程2x﹣1﹣a=0的根是3则a的值为
4
﹣4
5
﹣5
若关于x的分式方程有增根则该方程的增根为
方程x﹣32=x﹣3的根为
3
4
4或3
﹣4或3
设α和β是方程x2-4x+5=0的二根则α+β的值为________.
关于x的方程x2+3x+a=0有一个根为-1则另一个根为
-2
2
4
-3
方程x2+2x-4=0的两根为x1x2则x1+x2的值为
2
﹣2
4
﹣4
若关于x的方程x2+3x+a=0有一个根为﹣1则另一个根为
﹣2
2
4
﹣3
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