โจ Best Answer โจ
้ใฏ็ธฆ14mๅ
้จใซใไธไธ2ใคใใใใใ2xๅใใใ
ใ ใใใ2x๏ผ14ใใใx๏ผ14/2๐
Mathematics
Junior High
Solved
๐ฅใฎ2ๅใฎ14ใฏไฝใงใใ๏ผ
15
ๅณใฎใใใซใ ็ธฆ14mใ ๆจช 16mใฎ้ทๆนๅฝขใฎ
ใฏใฐ
ๅๅฐใซใๅน
ใไธๅฎใฎ้ใจ่ฑใ ใใใคใใใพใใ ่ฑ
ใ ใใฎ้ข็ฉใ 80mยฒ ใซใใใซ
16m
ใฏใ้ใฎๅน
ใไฝm ใซใใใฐ
ใใใงใใใ
้
xm
่ฑใ ใ
14m
2
้ใฎๅน
ใ x ใจใใใจใ
80m
(14-2x) (16-2x) = 80
224-60x+4m2 = 80
ไธก่พบใ 4ใงใใฃใฆๆด็ใใใจใ
x2-15x+36 = 0
(x-12)(x-3) = 0
x=12ใ x = 3
14
0<x< ใงใใใใใ x=3ใฏๅ้กใซ
2
้ฉใใฆใใใ,12ใฏ้ฉใใฆใใชใใ 3m
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