配套习题- 一元二次方程概念 -【青果学院】

1/5单选题

难度：

1.下列方程中是关于x的一元二次方程的是( )

A
B	ax²+bx+c=0
C	(x-1)(x+2)=1
D	3x²-2xy-5y²=0

正确答案：Qw==

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

2/5单选题

难度：

2.若关于x的方程是一元二次方程

，则k的值为( )

A	±2
B	2
C	-2
D	-1

正确答案：Qw==

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

3/5单选题

难度：

3.方程x²-2(3x-2)+(x+1)=0的一般形式是( )

A	x²-5x+5=0
B	x²+5x+5=0
C	x²+5x-5=0
D	x²+5=0

正确答案：QQ==

6Kej562U77ya4oi1eDxzdXA+Mjwvc3VwPi0yKDN4LTIpKyh4KzEpPTA8YnI+4oi0PGltZyB3aWR0aD0yNCBoZWlnaHQ9MjEgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8zRS9FOS9yQkFDSjFUSW1ramc0R3kxQUFBQk8zZXg4Ykk1MTgucG5nIj4tNngrNCt4KzE9MDxicj7iiLQgeDxzdXA+Mjwvc3VwPi01eCs1PTA8YnI+5pWF6YCJQQ==

4/5单选题

难度：

4.一元二次方程7x²—2x=0的二次项、一次项、常数项依次是 ( )

A	7x²，2x，0
B	7x²，-2x，无常数项
C	7x²，0，2x
D	7x²，-2x，0

正确答案：RA==

6Kej562U77yaN3g8c3VwPjI8L3N1cD7igJQyeD0w55qE5LqM5qyh6aG544CB5LiA5qyh6aG544CB5bi45pWw6aG55L6d5qyh5pivN3g8c3VwPjI8L3N1cD7vvIwtMnjvvIwwPGJyPuaVhemAiUQ=

5/5单选题

难度：

5.若x=2是关于x的一元二次方程x²-mx+8=0的一个解，则m的值是( )

A	6
B	5
C	2
D

正确答案：QQ==

6Kej562U77ya4oi1eD0y5piv5YWz5LqOeOeahOS4gOWFg+S6jOasoeaWueeoi3g8c3VwPjI8L3N1cD4tbXgrOD0w55qE5LiA5Liq6KejPGJyPuKItOaKing9MuW4puWFpXg8c3VwPjI8L3N1cD4tbXgrOD0w5Lit5b6XPGJyPjxpbWcgd2lkdGg9NzUgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvNzMvMUYvckJBQ0UxVEltb3J6eF9QNUFBQUIxcnBUbExNMzkxLnBuZyI+PTA8YnI+4oi0bT02PGJyPuaVhemAiUE=