配套习题- 实际问题与一元二次方程 -【青果学院】

1/5单选题

难度：

1.上海世博会的某纪念品原价168元，连续两次降价a%后售价为128元，下面所列方程中正确的是

A	168(1＋a%)²＝128
B	168(1－a%)²＝128
C	168(1－2a%)＝128
D	168(1－a2%)＝128

正确答案：Qg==

6Kej562U77ya4oi15Y6f5Lu35Li6MTY45YWD77yM56ys5LiA5qyh6ZmN5Lu35ZCO5Li6MTY477yIMTxpbWcgd2lkdGg9MTQgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvOTEvOTEvckJBQ0psV2JkSFdTVEg4OUFBQUF2VGVsSFQwMjY3LnBuZyI+PGk+YTwvaT4l77yJ77yM56ys5LqM5qyh6ZmN5Lu35ZCOMTY4PGltZyB3aWR0aD02MyBoZWlnaHQ9MjEgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC85MS9BRS9yQkFDSjFXYmRIV1JWQlE2QUFBQjllYlg0NzQwMTUucG5nIj48YnI+4oi0IDE2OCgx77yNPGk+YTwvaT4lKTxzdXA+Mjwvc3VwPu+8nTEyODxicj7mlYXpgIlC

2/5单选题

难度：

2.某中学准备建一个面积为375m²的矩形游泳池，且游泳池的宽比长短10m．设游泳池的长为xm，则可列方程（　　）　

A	x（x﹣10）=375
B	x（x+10）=375
C	2x（2x﹣10）=375
D	2x（2x+10）=375

正确答案：QQ==

6Kej562U77ya4oi1IOiuvua4uOazs+axoOeahOmVv+S4unht77yM5YiZ5a695Li6eDxpbWcgd2lkdGg9MzggaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvQzcvODgvckJBQ0UxV2JkSVBUTFRNVUFBQUJZRGpJODN3NDc3LnBuZyI+PGJyPuaJgOS7pSDmoLnmja7popjmhI/lvpc8YnI+eO+8iHjvuaMxMO+8iT0zNzU8YnI+5pWF6YCJQQ==

3/5单选题

难度：

3.在某次聚会上，每两人都握了一次手，所有人共握手10次，设有x人参加这次聚会，则列出方程正确的是（　　）

A	x（x﹣1）=10
B	=10
C	x（x+1）=10
D	=10

正确答案：Qg==

6Kej562U77ya4oi15pyJeOS6uuWPguWKoOi/measoeiBmuS8mu+8jOaJgOacieS6uuWFseaPoeaJizEw5qyhPGJyPuaJgOS7peagueaNrumimOaEj+W+lzxicj48aW1nIHdpZHRoPTkwIGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwL0M3Lzg4L3JCQUNFMVdiZEllaGRwdXNBQUFDZjRhZWU4Yzk2MS5wbmciPjxicj7mlYXpgIlC

4/5单选题

难度：

4.若两个连续整数的积是56,则它们的和是 ( )

A	±15
B	15
C	-15
D	11

正确答案：QQ==

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

5/5单选题

难度：

5.如图，在长为100米，宽为80米的矩形场地上修建两条宽度相等且互相垂直的道路，剩余部分进行绿化，要使绿化面积为7644米²，则道路的宽应为多少米？设道路的宽为x米，则可列方程为（　　）

A	100×80﹣100x﹣80x=7644
B	（100﹣x）（80﹣x）+x²=7644
C	（100﹣x）（80﹣x）=7644
D	100x+80x=356

正确答案：Qw==

6Kej562U77ya5aaC5Zu+56m655m96YOo5YiG5Li657u/5YyW6Z2i56evPGJyPu+8iDEwMO+5o3jvvInvvIg4MO+5o3jvvIk9NzY0NDxicj48YnI+5pWF6YCJQzxicj48YnI+PGltZyB3aWR0aD01MTYgaGVpZ2h0PTE5MyBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzM3L0NBL3JCQUNGRldiZElEVFhhem5BQUFPS0JWTm41VTc0NS5wbmciPjxicj48YnI+