初三数学 (人教版上册)
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.用长8m的铝合金条制成如图形状的矩形窗框,使窗户的透光面积最大,那么这个窗户的最大透光面积是( )m2
A: |
B: |
C: |
D: 4 |
一次做对,真牛!
+5奖励规则>
- 提示1:IOiuvueql+eahOmrmOW6puS4unht77yM5qC55o2u55+p5b2i6Z2i56ev5YWs5byP5YiX5Ye65LqM5qyh5Ye95pWw5rGC5Ye95pWw5YC855qE5pyA5aSn5YC85Y2z5Y+vLg==
- 答案:Qw==
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本课配套习题挑战模式2/5
单选题
难度系数:
2.用铝合金型材做一个形状如图1的矩形窗框,设窗框的一边为xm,窗户的透光面积为ym2,y与x的函数图象如图2. 当窗户透光面积最大时,窗框的另一边长是( )
A: 1米 |
B: 1.5米 |
C: 2米 |
D: 2.5米 |
一次做对,真牛!
+5奖励规则>
- 提示1:IOWboOS4ung9MeaXtu+8jOmdouenr+acgOWkp++8jOS4ujEuNe+8jOagueaNruWbvuW9ouaYr+efqeW9ou+8jOeUsemdouenr+WFrOW8j+aYk+W+l+WPpuS4gOi+ueS4ujEuNeexsy4=
- 答案:Qg==
6Kej77ya55Sx5Zu+6LGh5Y+v55+l77yM5b2TeD0x5pe277yM56qX5oi36YCP5YWJ6Z2i56ev5pyA5aSnLiA8YnI+5Zug5Li65pyA5aSn6YCP5YWJ6Z2i56ev5pivMS415bmz5pa557Gz77yM5Y2z55+p5b2i55qE5pyA5aSn6Z2i56ev5pivMS415bmz5pa557Gz77yM5q2k5pe2eD0x57Gz77yMPGJyPuagueaNruefqeW9oumdouenr+iuoeeul+WFrOW8j++8jOWPpuS4gOi+ueS4ujEuNeexsy4gPGJyPuaVhemAie+8mkIuIA==
本课配套习题挑战模式3/5
单选题
难度系数:
3.把一段长1.6m的铁丝围成长方形ABCD,设宽为xm,面积为ym2. 则当y最大时,x所取的值是( )
A: 0.5 |
B: 0.4 |
C: 0.3 |
D: 0.6 |
一次做对,真牛!
+5奖励规则>
- 提示1:IOWFiOagueaNruWRqOmVv+ihqOekuuWHuumVv+aWueW9oueahOmVv++8jOeUsemVv+aWueW9oueahOmdouenr+WFrOW8j+WPr+S7peaxguWHuuihqOi+vuW8j++8jOagueaNruWHveaVsOeahOino+aekOW8j+eahOaAp+i0qOWwseWPr+S7peaxguWHuue7k+iuui4=
- 答案:Qg==
6Kej77ya55Sx6aKY5oSP77yM5b6XPGJyPnk9eO+8iDAuOC1477yJ77yMPGJyPnk9LXg8c3VwPjI8L3N1cD4rMC44eO+8jDxicj49Le+8iHgtMC4077yJPHN1cD4yPC9zdXA+KzAuMTY8YnI+4oi0YT0tMe+8nDDvvIw8YnI+4oi05oqb54mp57q/5byA5Y+j5ZCR5LiL77yM5b2TeD0wLjTml7bvvIx55pyA5aSn5YC8LiA8YnI+5pWF6YCJQi4g
本课配套习题挑战模式4/5
单选题
难度系数:
4.如图,一边靠校园围墙,其他三边用总长为40米的铁栏杆围成一个矩形花圃,设矩形ABCD的边AB为x米,面积为S平方米,要使矩形ABCD面积最大,则x的长为( )米
A: 10 |
B: 15 |
C: 20 |
D: 25 |
一次做对,真牛!
+5奖励规则>
- 提示1:IOWFiOaxguWHuuino+aekOW8jw==
- 提示2:IOaxguWHunjnmoTlj5blgLzojIPlm7Q=
- 答案:QQ==
6Kej77ya6K6+55+p5b2iQUJDROeahOi+uUFC5Li6eOexs++8jOWImeWuveS4ujQwLTJ477yMPGJyPlM977yINDAtMnjvvIl4PS0yeDxzdXA+Mjwvc3VwPis0MHguIDxicj7opoHkvb/nn6nlvaJBQkNE6Z2i56ev5pyA5aSn77yMPGJyPuWImXg9LTxpbWcgd2lkdGg9MTIgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvNjIvODkvckJBQ0ZGT1Zkdk9CYXhPRkFBQUJaMHpjSTJFMjIxLnBuZyI+PSAxMG3vvIw8YnI+5Y2zeOeahOmVv+S4ujEwbS4gPGJyPuaVhemAiUEuIA==
本课配套习题挑战模式5/5
单选题
难度系数:
5.如图,某厂有许多形状为直角梯形的铁皮边角料,为节约资源,现要按图中所示的方法从这些边角料上截取矩形(阴影部分)片备用,当截取的矩形面积最大时,矩形两边长x、y应分别为( )
A: x=10,y=14 |
B: x=14,y=10 |
C: x=12,y=15 |
D: x=15,y=12 |
一次做对,真牛!
+5奖励规则>
- 提示1:IOeUseebtOinkuS4ieinkuW9ouebuOS8vOW+lzxpbWcgd2lkdGg9MjUgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvNjIvODkvckJBQ0ZGT1ZkdVBRUUx6NkFBQUJ0VTg2UVQwMzEyLnBuZyI+PTxpbWcgd2lkdGg9MTIgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvOUUvQTAvckJBQ0UxT1ZkdU9qTl9KOUFBQUJYU0V5UmJJMDk2LnBuZyI+77yM5b6XeD08aW1nIHdpZHRoPTY3IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzlFL0EwL3JCQUNFMU9WZHVQelhscnhBQUFDVFVlcWRSNDc4Mi5wbmciPg==
- 提示2:IOWMlueugOefqeW9oumdouenr1M9eHnnmoTop6PmnpDlvI/kuLpTPS09eHk9LTxpbWcgd2lkdGg9NiBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC82Mi84OS9yQkFDRkZPVmR1T1NyS2J5QUFBQk5qZkFLbzA3MDAucG5nIj7vvIh5LTEy77yJPHN1cD4yPC9zdXA+KzE4MO+8jA==
- 提示3:IOWGjeWIqeeUqOS6jOasoeWHveaVsOeahOaAp+i0qOaxguWHulMg55qE5pyA5aSn5YC877yM5Lul5Y+K5Y+W5b6X5pyA5aSn5YC85pe2eOOAgXnnmoTlgLwu
- 答案:RA==
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