辽宁省抚顺市新宾满族自治县2024-2025学年七年级上学期11月期中考试数学试题
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这是一份辽宁省抚顺市新宾满族自治县2024-2025学年七年级上学期11月期中考试数学试题,文件包含辽宁省抚顺市新宾满族自治县2024-2025学年七年级上学期11月期中考试数学试题docx、辽宁省抚顺市新宾满族自治县2024-2025学年七年级上学期11月期中考试数学试题答案docx等2份试卷配套教学资源,其中试卷共10页, 欢迎下载使用。
一、选择题(每题3分)
1.B 2.B 3.D 4.C 5.C 6.A 7.C 8.D 9.D 10.D
二、填空题(每题3分)
11. mn2(答案不唯一) 12. a+b﹣c 13. 10 14. (3a﹣b)2 15. 3
三、解答题(共75分)
16.(12分)
解:(1)23+(﹣14)﹣(﹣10)
=23﹣14+10
=9+10
=19; ·······················3分
(2)
=
=.
=﹣8+1
=﹣7; ·······················6分
(3)
=
=
=; ·······················9分
(4)
=
=6+9
=15. ·······················12分
(7分)
解:3y2﹣x2+2(2x2﹣3xy)﹣3(x2+y2)
=3y2﹣x2+4x2﹣6xy﹣3x2﹣3y2
=﹣6xy ·······················4分
当x=1,y=﹣2时,原式=﹣6×1×(﹣2)=12.·······················7分
18.(6分)
解:在数轴上表示为:
·······················3分
∴.·······················6分
(8分)
解:(1)+12﹣8+7﹣10+8
=27﹣18
=9.·······················4分
答:B地在A地的正东方,它们相距9千米.
(2)(12+8+7+10+8)×5
=45×5
=225(升).
答:该天共耗油225升.·······················8分
(8分)
解:[﹣5﹣(﹣8.6)]÷0.6×100·······················4分
=3.6÷0.6×100
=600(米).·······················7分
答:该山峰高600米.·······················8分
(10分)
解:(1)大三角形面积为:×4×8=16cm2,
小直角三角形的面积为:×(8﹣4)×(4﹣x)=(8﹣2x)cm2,
∴S=8×4﹣16﹣(8﹣2x)=(8+2x)cm2.·······················5分
将x=3代入上式,S=8+2×3=14cm2.······················10分
(12分)
解:(1)﹣(a﹣b)2.··························4分
(2)∵3x2﹣6y﹣21=3(x2﹣2y)﹣21,
又∵x2﹣2y=4,
∴原式=3×4﹣21
=12﹣21
=﹣9;···································8分
(3)∵(a﹣3c)+(5b﹣d)﹣(5b﹣3c)
=a﹣3c+5b﹣d﹣5b+3c
=(a﹣5b)+(5b﹣3c)+(3c﹣d)
∴当a﹣5b=3,5b﹣3c=﹣5,3c﹣d=10时,
原式=3+(﹣5)+10
=8.······································12分
(12分)
解:(1)8,2n;·····························4分
(2)由(1)知经过n次捏合后,可以拉出2n根细面条,
当2n=32时,n=5;
∴到第5次捏合后可拉出32根细面条;························8分
(3)60×210=61440≈6×104cm;
答:拉出的细面条的总长度为6×104cm.·····················12分
※说明:
解答题解题过程方法不唯一,请阅卷教师自行判断,统一给分标准。
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