初三数学 (北师版)
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:
1.一件工艺品进价为100元,标价135元售出,每天可售出100件. 根据销售统计,一件工艺品每降价1元出售,则每天可多售出4件,要使每天获得的利润最大,每件需降价的钱数为( )
A: 5元 |
B: 10元 |
C: 0元 |
D: 36元 |
一次做对,真牛!
+5奖励规则>
- 提示1:IOiuvuavj+S7tumcgOmZjeS7t+eahOmSseaVsOS4unjlhYPvvIzmr4/lpKnojrfliKl55YWD77yM5YiZ5Y+v5rGC5Ye6eeS4jnjkuYvpl7TnmoTlh73mlbDlhbPns7vlvI/vvIzlhpnmiJDpobbngrnlvI/lkI7nm7TmjqXop6PnrZQu
- 答案:QQ==
6Kej77ya6K6+5q+P5Lu26ZyA6ZmN5Lu355qE6ZKx5pWw5Li6eOWFg++8jOavj+WkqeiOt+WIqXnlhYPvvIw8YnI+5YiZeT3vvIgxMzUteC0xMDDvvInvvIgxMDArNHjvvIk8YnI+5Y2z77yaeT0tNO+8iHgtNe+8iTxzdXA+Mjwvc3VwPiszNjAwPGJyPuKItS0077ycMDxicj7iiLTlvZN4PTXlhYPml7bvvIzmr4/lpKnojrflvpfnmoTliKnmtqbmnIDlpKcuIDxicj7mlYXpgIlBLiA=
本课配套习题挑战模式2/5
单选题
难度系数:
2.生产季节性产品的企业,当它的产品无利润时就会及时停产. 现有一生产季节性产品的企业,其一年中获得的利润y和月份n之间函数关系式为y=-n2+14n-24,则该企业一年中应停产的月份是( )
A: 1月、2月、3月 |
B: 2月、3月、4月 |
C: 1月、2月、12月 |
D: 1月、11月、12月 |
一次做对,真牛!
+5奖励规则>
- 提示1:IOagueaNruino+aekOW8j++8jOaxguWHuuWHveaVsOWAvHnnrYnkuo4w5pe25a+55bqU55qE5pyI5Lu977yM5L6d5o2u5byA5Y+j5pa55ZCR5Lul5Y+K5aKe5YeP5oCn77yM5YaN5rGC5Ye6eeWwj+S6jjDml7bnmoTmnIjku73ljbPlj6/op6PnrZQu
- 答案:Qw==
6Kej77yaPGJyPuKItXk9LW48c3VwPjI8L3N1cD4rMTRuLTI0PGJyPj0t77yIbi0y77yJ77yIbi0xMu+8ie+8jDxicj7lvZN5PTDml7bvvIx4PTLmiJbogIV4PTEyLiA8YnI+5Y+I4oi15Zu+6LGh5byA5Y+j5ZCR5LiL77yMPGJyPuKItDHmnIjvvIx577ycMO+8mzLmnIjjgIExMuaciO+8jHk9MC4gPGJyPuKItOivpeS8geS4muS4gOW5tOS4reW6lOWBnOS6p+eahOaciOS7veaYrzHmnIjjgIEy5pyI44CBMTLmnIguIDxicj7mlYXpgIlDLiA=
本课配套习题挑战模式3/5
单选题
难度系数:
3.某公司在甲、乙两地同时销售某种品牌的汽车. 已知在甲、乙两地的销售利润y(单位:万元)与销售量x(单位:辆)之间分别满足:y1=-x2+10x,y2=2x,若该公司在甲,乙两地共销售15辆该品牌的汽车,则能获得的最大利润为( )
A: 30万元 |
B: 40万元 |
C: 45万元 |
D: 46万元 |
一次做对,真牛!
+5奖励规则>
- 提示1:IOmmluWFiOagueaNrumimOaEj+W+l+WHuuaAu+WIqea2puS4jnjkuYvpl7TnmoTlh73mlbDlhbPns7vlvI/vvIzov5vogIzmsYLlh7rmnIDlgLzljbPlj68u
- 答案:RA==
6Kej77ya6K6+5Zyo55Sy5Zyw6ZSA5ZSueOi+hu+8jOWImeWcqOS5meWcsOmUgOWUru+8iDE1LXjvvInph4/vvIzmoLnmja7popjmhI/lvpflh7rvvJo8YnI+Vz15PHN1Yj4xPC9zdWI+K3k8c3ViPjI8L3N1Yj49LXg8c3VwPjI8L3N1cD4rMTB4KzLvvIgxNS1477yJPS14PHN1cD4yPC9zdXA+Kzh4KzMw77yMPGJyPuKItOacgOWkp+WIqea2puS4uu+8mjxpbWcgd2lkdGg9MzYgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvNjIvOEEvckJBQ0ZGT1ZkMkt6NzhrSEFBQUJ4bmFBNG0wNjQ2LnBuZyI+PTQ25LiH5YWDPGJyPumAiUQ8YnI+
本课配套习题挑战模式4/5
单选题
难度系数:
4.生产季节性产品的企业,当它的产品无利润时就会及时停产,现有一生产季节性产品的企业,一年中获得利润y与月份n之间的函数关系式是y=-n2+15n-36,那么该企业一年中应停产的月份是( )
A: 1月,2月 |
B: 1月,2月,3月 |
C: 3月,12月 |
D: 1月,2月,3月,12月 |
一次做对,真牛!
+5奖励规则>
- 提示1:IOaxguWHuuWIqea2puS4ujDml7Zu55qE5YC877yM5Y2z5LukeT0w77yM5YiZLW48c3VwPjI8L3N1cD4rMTVuLTM2PTDvvIzop6PmlrnnqIvlvpfliLBuPHN1Yj4xPC9zdWI+PTPvvIxuPHN1Yj4yPC9zdWI+PTEy77yM5omA5LulM+aciOWSjDEy5pyI6KaB5YGc5Lqn77yM54S25ZCO5qC55o2u5LqM5qyh5Ye95pWw55qE5oCn6LSo5b6X5Yiw5oqb54mp57q/5byA5Y+j5ZCR5LiL77yM5YiZbj0x5ZKMbj0y5pe277yMee+8nDDvvIzkuo7mmK/lvpfliLDor6XkvIHkuJrkuIDlubTkuK3lupTlgZzkuqfnmoTmnIjku73ov5jmnInmmK8x5pyI77yMMuaciC4=
- 答案:RA==
6Kej77ya5LukeT0w77yM5YiZLW48c3VwPjI8L3N1cD4rMTVuLTM2PTDvvIw8YnI+4oi0bjxzdXA+Mjwvc3VwPi0xNW4rMzY9MO+8jDxicj7iiLTvvIhuLTPvvInvvIhuLTEy77yJPTDvvIw8YnI+4oi0bjxzdWI+MTwvc3ViPj0z77yMbjxzdWI+Mjwvc3ViPj0xMu+8jDxicj7iiLVhPS0x77ycMO+8jDxicj7iiLTmipvniannur/lvIDlj6PlkJHkuIvvvIw8YnI+4oi0bj0x5ZKMbj0y5pe277yMee+8nDDvvIw8YnI+4oi06K+l5LyB5Lia5LiA5bm05Lit5bqU5YGc5Lqn55qE5pyI5Lu95pivMeaciO+8jDLmnIjvvIwz5pyI77yMMTLmnIguIDxicj7mlYXpgIlELiA=
本课配套习题挑战模式5/5
单选题
难度系数:
5.某企业进行了制度创新和技术改造,效益逐年提高. 下面是年利润的几个统计数据(单位均为百万元):1999年8.6,2000年10.4,2001年12.9,且年利润与年号间的关系可以近似地用二次函数来反映. 由此,请你预测2002年的年利润应为( )
A: 14 |
B: 15.4 |
C: 16.1 |
D: 20.16 |
一次做对,真牛!
+5奖励规则>
- 提示1:IOmmluWFiOagueaNrumimOaEj+iuvuW5tOWIqea2puS4juW5tOWPt+mXtOeahOWFs+ezu+S4uu+8mnk9YXg8c3VwPjI8L3N1cD4rYngrYw==
- 提示2:IOeEtuWQjuacieW+heWumuezu+aVsOazleaxguW+l+S6jOasoeWHveaVsOeahOino+aekOW8j++8jOWGjeeUsXg9MjAwMuS7o+WFpeaxguino+WNs+WPr+axguW+l+etlOahiA==
- 答案:Qw==
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