(1)~(3)ใพใงใงใ
ใใใใชใใจใใใใใฃใใ่จใฃใฆใใ ใใใญ(โงโฝโฆ)
ใใใใใใใงใ๏ผ
ใใใใจใใใใใพใ๐
ใใใใ๏ฝกโโฟโ๏ฝก
Mathematics
Junior High
๐๐๐๐๐ปโโ๏ธ
2็ชใฎ1~4ใๅใใใพใใ
ๅ็ญใจ่งฃ่ชฌใ่ผใใฆใใใ ใใใๅฉใใใพใ
ใใใใใ้กใใใพใ๏ผ
2
ๆฌกใฎๅๅใใซ็ญใใใ
(1) Aใใใฎ็ถ่ฆชใฎๅนดไปคใฏใAใใใฎใกใใใฉ4ๅใงใใใใพใๆฏ่ฆชใฏ็ถ่ฆชใใ3ๆญณๅนดไธใง,3ไบบใฎๅนดไปค
ใฎๅ่จใฏ78ๆญณใซใชใใ Aใใใฎๅนดไปคใๆฑใใใ
้็ด (ไบบ)
ๅบฆๆฐ(ๅฐ)
(2) ๅณใฎ่กจใฏ, ใใ้ง
ใซ, 1ๆฅใซๅฐ็ใใใใน40ๅฐใซใคใใฆ,ใใฎ้ง
ใงใ
ใใใใฎใในใใ้ใใไนๅฎขใฎไบบๆฐใ่ชฟในใๅบฆๆฐๅๅธ่กจใซใพใจใใใใฎ
ใงใใใ ใใฎ่กจใง, 12ไบบไปฅไธ16ไบบๆชๆบใฎ้็ดใฎ็ธๅฏพๅบฆๆฐใๆฑใใใ
ไปฅไธ ๆชๆบ
0~4
3
4~8
8~12
12~16
16~20
20~24
่จ
(3) ๅณใฎๅณใฏ,็ดๅพ6cmใฎๅ็ใจ, ๅบ้ขใฎ็ดๅพใ6cmใงใๆฏ็ทใฎ้ท
ใใ5cmใฎๅ้ใ็ตใฟๅใใใๅณๅฝขใงใใใ ใใฎ็ซไฝใฎ่กจ้ข็ฉใฏ
ไฝcmยฒใ, ๆฑใใใ ใใ ใ, ๅๅจ็ใฏใจใใใ
(4) ๅณใฎๅณใฎใใใซ็ด็ทโใจ2็นA,Bใใใใ ็น
Pใฏ็ด็ทโไธใซใใ, PABใฏ,โ PAB=โ PBAใจ
ใชใไบ็ญ่พบไธ่งๅฝขใงใใใ ใใฎใจใ, ็นPใๅฎ่ฆใจ
ใณใณใในใ็จใใฆไฝๅณใใใ ใใ ใ,ไฝๅณใซ็จใใ
็ทใฏๆถใใชใใงใใใใจใ
A.
5cm
6cm
45 16 102
40
B
2
Answers
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