19 ๅใๅคงใใใฎใตใคใณใญใ2ๅๅๆใซใตใใพใใใใใซใคใใฆ,ๆฌกใฎๅๅใใซ็ญใใชใใใ
(1) ๅบใ็ฎใฎ็ฉใ10ใงใใๅใใใใใช็ฎใฎๅบๆนใฎ็ตใฏใๅ
จ้จใงไฝ้ใใใใพใใใ
(2) ๅบใ็ฎใฎ็ฉใ6ใงใใๅใใใใใช็ฎใฎๅบๆนใฎ็ตใฏ,ๅ
จ้จใงไฝ้ใใใใพใใใ
(2) ไฝๆไฝฟใฃใฆใใใใจใใใจใไฝใใใจใใงใใ้้กใฏใๅ
จ้จใงไฝ้ใใใใพใใใ
11 ๅณใฎๅณใฎใใใซใ16ๅใฎ็นใ1cm้ใใใงไธฆใใงใใพใใ ใใฎไธญใใ
4ๅใฎ็นใ็ตใใงๆญฃๆนๅฝขใไฝใใพใใใใใซใคใใฆ,ๆฌกใฎๅๅใใซ็ญใ
ใชใใใ
โก(1) ้ข็ฉใ2cmยฒใฎๆญฃๆนๅฝขใฏไฝๅใงใใพใใใ
10 10ๅ็ใ3ๆใ50ๅ็ใ2ๆ,100ๅ็ใ1ๆใใใพใใใใใซใคใใฆ,ๆฌกใฎๅๅใใซ็ญใใชใ
โก(1) ใใฎไธญใใ2ๆใไฝฟใฃใฆไฝใใใจใใงใใ้้กใฏ,ๅ
จ้จใงไฝ้ใใใใพใใใ
ๅ)
Icm
้ใ)
Icm
้ใ)
้ใ)
้ใ)
้ใ)