中学生网络课堂
初三数学 (苏教版下册)
二次函数综合
本课配套习题挑战模式1/5
单选题
难度系数：
1.某公司经销一种成本为10元/件的产品，经市场调查发现，在一段时间内，销售量y（件）随销售单价x（元）的变化而变化，其函数关系式为y=-10x+700，设这种产品在这段时间内的销售利润为w（元），销售利润w与销售单价x之间的函数关系式为（ ）
| A: w=-10x2+700x |
| B: w=-10x2+800x-7000 |
| C: w=-10x2+7000 |
| D: w=-10x2+800x+7000 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOmUgOWUruWIqea2pj3ljZXku7bliKnmtqbDl+mUgOmHj++8jOS7o+WFpeWNs+WPr+W+l+WHunfkuI545LmL6Ze055qE5YWz57O75byP
- 答案：Qg==
6Kej77yadz3vvIh4LTEw77yJw5fvvIgtMTB4KzcwMO+8iT0tMTB4PHN1cD4yPC9zdXA+KzgwMHgtNzAwMDxicj7mlYXpgIlC44CC
本课配套习题挑战模式2/5
单选题
难度系数：
2.某公司在甲乙两地同时销售一种品牌车，利润（单位：万元）分别为L1＝−x2+21x和L2=2x，其中x为销售量（单位：辆）. 若该公司在两地共销售15辆，则能获得的最大利润为（ ）
| A: 90万元 |
| B: 90万元 |
| C: 120万元 |
| D: 120.25万元 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOiuvuWFrOWPuOWcqOeUsuWcsOmUgOWUruWTgeeJjOi9pnjovobvvIzliJnlnKjkuZnlnLDplIDllK7lk4HniYzovabvvIgxNS1477yJ6L6G77yM5qC55o2u5Yip5ram5Ye95pWw6KGo56S65Ye65Yip5ram77yM5Yip55So6YWN5pa55rOV5rGC5Ye65Ye95pWw55qE5pyA5YC8Lg==
- 答案：Qw==
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
本课配套习题挑战模式3/5
单选题
难度系数：
3.某商店经销一种成本为每千克40元的产品，据市场分析，若按每千克50元销售，一个月售出500千克；销售单价每涨1元，月销售量就减少10千克，针对以上销售情况，当定价为（）元时，月销售利润最大。
| A: 50 |
| B: 60 |
| C: 70 |
| D: 80 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOmUgOWUruWIqea2pj3mr4/ku7bkuqflk4HnmoTliKnmtqbDl+WPr+WUruWHuuS6p+WTgeeahOaVsOmHj++8jOaKiuebuOWFs+aVsOWAvOS7o+WFpe+8jOW+l+WIsOS6jOasoeWHveaVsOeahOWFs+ezu+W8j++8jOeUqOWFrOW8j+azleW+l+WIsOS6jOasoeWHveaVsOeahOacgOWAvOmXrumimC4=
- 答案：Qw==
6Kej77ya6K6+5Yip5ram5Li6eeWFg++8jDxicj7liJl5Pe+8iHgtNDDvvIlbNTAwLe+8iHgtNTDvvInDlzEwXT14PHN1cD4yPC9zdXA+LTE0MHgrNDgwMDxicj4geD0gLTxpbWcgd2lkdGg9MTEgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvOUUvOEQvckJBQ0UxT1ZhdXp4VnRaTEFBQUJYMzItNkowNTYxLnBuZyI+PTcwPGJyPuW9k+WumuS7t+S4ujcw5YWD5pe277yM5pyI6ZSA5ZSu5Yip5ram5pyA5aSn
本课配套习题挑战模式4/5
单选题
难度系数：
4.某商场试销一种成本为每件60元的服装，规定试销期间销售单价不低于成本单价，且获利不得高于50%，经试销发现，销售量y（件）与销售单价x（元）的关系符合一次函数y=-x+140. 若获得利润不低于1200元，试确定销售单价x的范围.
| A: 80≤x≤90 |
| B: 60≤x≤90 |
| C: 60＜x＜90 |
| D: 80＜x＜90 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOagueaNruWIqea2pj3vvIjllK7ku7ct5oiQ5pys77yJw5fplIDllK7ph4/liJflh7rlh73mlbDlhbPns7vlvI8=
- 提示2：55Sx6aKY5oSP5Y+v55+l6ZSA5ZSu5Y2V5Lu3eOeahOWPluWAvOiMg+WbtOS4uu+8muWkp+S6juetieS6juaIkOacrO+8jOWwj+S6juetieS6juaIkOacrMOX77yIMSs1MCXvvIk=
- 提示3：IOS7pOWHveaVsOWFs+ezu+W8j1c9MTIwMO+8jOino+W+l3jvvIznhLblkI7ov5vooYzorqjorro=
- 答案：QQ==
6Kej77yaVz3vvIh4LTYw77yJ77yILXgrMTQw77yJPS14PHN1cD4yPC9zdXA+KzIwMHgtODQwMD0t77yIeC0xMDDvvIk8c3VwPjI8L3N1cD4rMTYwMO+8jDxicj7nlLHpopjmhI/lj6/nn6XplIDllK7ljZXku7d455qE5Y+W5YC86IyD5Zu05Li677yaNjDiiaR44omkOTDvvJs8YnI+5oqb54mp57q/55qE5byA5Y+j5ZCR5LiL77yMPGJyPuKItOW9k3jvvJwxMDDml7bvvIxX6ZqPeOeahOWinuWkp+iAjOWinuWkp++8jDxicj7ogIw2MOKJpHjiiaQ5MO+8jDxicj7nlLFXPTEyMDDvvIzlvpcxMjAwPS14PHN1cD4yPC9zdXA+KzIwMHgtODQwMO+8jDxicj7mlbTnkIblvpfvvIx4PHN1cD4yPC9zdXA+LTIwMHgrOTYwMD0w77yMPGJyPuino+W+l++8jHg8c3ViPjE8L3N1Yj49ODDvvIx4PHN1Yj4yPC9zdWI+PTEyMO+8jDxicj7lj6/nn6XopoHkvb/ojrflvpfliKnmtqbkuI3kvY7kuo4xMjAw5YWD77yM6ZSA5ZSu5Y2V5Lu35bqU5ZyoODDlhYPliLAxMjDlhYPkuYvpl7TvvIw8YnI+6ICMNjDiiaR44omkOTDvvIw8YnI+5omA5Lul77yM6ZSA5ZSu5Y2V5Lu3eOeahOiMg+WbtOaYrzgw4omkeOKJpDkwLiA=
本课配套习题挑战模式5/5
单选题
难度系数：
5.便民商店经营一种商品，在销售过程中，发现一周利润y（元）与每件销售价x（元）之间的关系满足y=-2（x-20）2+1558，由于某种原因，价格只能15≤x≤22，那么一周可获得最大利润是（ ）
| A: 20 |
| B: 1508 |
| C: 1550 |
| D: 1558 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOatpOmimOWunumZheS4iuaYr+axguS6jOasoeWHveaVsHk9LTLvvIh4LTIw77yJPHN1cD4yPC9zdXA+KzE1NTjlnKjlrprkuYnln5944oiI44CQMTXvvIwy44CR5YaF55qE5pyA5aSn5YC855qE6Zeu6aKY77yM5Zug5Li66K+l5LqM5qyh5Ye95pWw55qE5byA5Y+j5pa55ZCR5ZCR5LiL77yM5omA5Lul5b2TeC0yMD0w5pe277yMeeWPluacgOWkp+WAvA==
- 答案：RA==
6Kej77ya4oi15LiA5ZGo5Yip5ramee+8iOWFg++8ieS4juavj+S7tumUgOWUruS7t3jvvIjlhYPvvInkuYvpl7TnmoTlhbPns7vmu6HotrN5PS0y77yIeC0yMO+8iTxzdXA+Mjwvc3VwPisxNTU477yM5LiUMTXiiaR44omkMjLvvIw8YnI+4oi05b2TeD0yMOaXtu+8jHk8c3ViPuacgOWkp+WAvDwvc3ViPj0xNTU4LiA8YnI+5pWF6YCJRC4g
