四川省金堂县土桥中学2018-2019学年八年级上学期第一次月考数学试题

适用年级：初二
试卷号：213283

试卷类型：月考
试卷考试时间：2018/10/26

1.单选题(共7题)

以下语句及写成式子正确的是（）

A．7是49的算术平方根，即	B．7是的算术平方根，即
C．±7是49的平方根，即	D．±7是49的平方根，即

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下列说法错误的是（）

A．1的平方根是1	B．–1的立方根是－1
C．是2的平方根	D．–3是的平方根

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的平方根是

A．2

B．

C．

D．

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在下列各数中是无理数的个数有( )
－0.333…,

, -π, 3π, 3.1415, 2.010101…(相邻两个1之间有1个0),76.0123456…(小数部分由相继的正整数组成).

A．3个

B．4个

C．5个

D．6个

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下列说法正确的是（）

A．有理数只是有限小数	B．是分数
C．无限小数是无理数	D．无理数是无限小数

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底边上的高为3，且底边长为8的等腰三角形腰长为(　　)．

A．3

B．4

C．5

D．6

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下列各组中，不能构成直角三角形的是（）.

A．9，12，15

B．15，32，39

C．16，30，32

D．9，40，41

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2.选择题(共6题)

有理数5.614精确到百分位的近似数为{#blank#}1{#/blank#}．

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阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。

It's always thought that only those heavy things make people hard to endure.But as a matter of fact，those slight things are {#blank#}1{#/blank#} (much) difficult to resist.It's slight，but it will always be in the bottom of your heart，making it {#blank#}2{#/blank#} (possible) for you to get rid of it all through your life.

It's just like John Nash in “A Beautiful Mind”．You can imagine how terrible it is to live in a world full of mental illusion.When he realizes {#blank#}3{#/blank#} (clear) about all of these but can't get rid of the illusions，his mentality will be on the edge {#blank#}4{#/blank#} collapsing.On the other hand，Nash is happy and {#blank#}5{#/blank#} (luck) because his wife companied with him.She used her wifely heart to forgive all.When her husband {#blank#}6{#/blank#} (be) weak，she opened the window of his heart with her soft hands.She used her wifely endurance to go forward step by step in the difficult life.She used her wifely {#blank#}7{#/blank#} (persist) of love.

I can still remember the scene that when old Nash {#blank#}8{#/blank#} (stand) on the stage of Nobel Prizes，he looked at his wife full of love.I think Nash has found the answer of Balance Theory {#blank#}9{#/blank#} he has been studying throughout his life.The balance of his life is the love of his wife.

{#blank#}10{#/blank#} changes a lot with time，only love will last forever.

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10.下列离子组中，能够在溶液中共存，加入NaOH溶液有沉淀生成，加入稀盐酸有气体放出的是（）

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11.下列离子组中，能够在溶液中共存，加入NaOH溶液有沉淀生成，加入稀盐酸有气体放出的是（）

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12.在一堂关于“折纸问题”的数学综合实践探究课中，小明同学将一张矩形ABCD纸片，按如图进行折叠，分别在BC、AD两边上取两点E，F，使CE=AF，分别以DE，BF为对称轴将△CDE与△ABF翻折得到△C′DE与△A′BF，且边C′E与A′B交于点G，边A′F与C′D交于一点H．已知tan∠EBG= {#mathml#}