贵州省黔西南州勤智学校2023-2024学年数学七年级第一学期期末监测模拟试题含解析

2023-2024

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2.^«^«P*®1É2O^*,JW^«1.27ÜW,^Ü20^M»a:

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A.1.2x20+2(.x-20)=1.5xB.1.2x20+2x=1.5x

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C.-----------x=1.5xD.2.r-1.2x20=1.5x

2

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A.117B.250C.473D.1139

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A.2m+n=2fmB.21a+5=26aC.-2(x-4)=-2x+4D.2-3a=-(3a-2)

8.^Z4OD=18°,()

A.162°B.142°C.172°D.150°

9.M,&®QOtfy¥&OA=6,ZAOB=90°,WJ(90°fô)()

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22.(10#)ÆW4t^lRjæi5i£fé±Sië,

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23.(12#)i+W®

27

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2

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1>A

t#Wl^4-2x+2y»^4-2(x-y),=

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A.

2,A

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1.2x20+2(x-20)=1.5x.

1M&A.

3.A

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A.

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M:C.

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14,96°

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60

102°-6°=96°.

96°

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15.7.2x105

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4X(1+2+3+...+10)=4X(1+10)X104-2=1.

1

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2

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-21

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11

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11

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3

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l-3ba

a+b-(l-3b)b-2-a

11

(b-2-a)

a+b-(l-3b)-(b-2-a)1

11

.*.a+b-(l-3b)-(b-2-a)=l

^SW:2a+3b=l.

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20.EFfô&KÆsMh

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32(x+_y)=400

160(y-x)=400

x=5

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b=7.5c

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21,(1)ZBOC=125°;(2)ZABC=60°,ZACB=40°.

[W](1)È^Y^Wtt^nr^HiZOBC,ZOCB^ra,MlgHWrtÆOT

(2)ÈWÆWé5CW^HjZl+Z2=50°,SfêfêZl:Z2=3:2fiPW#»HlZl^Z2|ftOl,

[WJ(1)H^jZABC^ZACBWY^BO^COffi^^O,

^f^ZEBO=ZOBC=-ZABC,ZFCO=ZOCB=-ZACfi

22

XZABC=50°,ZACB=60°,

WZOBC=25°,ZOCB=30°

WZBOC=180°-ZOBC-ZOCB=125°

A

(2)S^JZBOC=130°,

WZ1+Z2=5O°

H^JZI:Z2=3:2

32

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