Mathematics
Junior High
็ทๆฅใงใ๐ญ๐ญ๐ญ๐ญ๐ญ
ใปใใจใซใชใในใๆฉใใ้กใใใพใ๐
1
-2 ใใใใๅณ1
ๅณ1ใฎใใใซใ2ใคใฎๆพ็ฉ็ทy=x2 ใจ y=
ใใฎ2ใคใฎๆพ็ฉ็ทไธใซ=a (a>0) ใจใชใ2็นA,Bใ
ใจใใy่ปธใซ้ขใใฆๅฏพ็งฐใจใชใ็นใใใใใC, D ใจใ,ๅ
่งๅฝขACDB ใไฝใใ ใพใ, ็นPใฏ็ด็ทAB ใใๅณๅดใซใ
ไธใฎ็นใงใใใใใฎใจใๆฌกใฎๅๅใใซ็ญใใชใ
yat is
1
ใใใใ ใOใๅ็นใจใใ่ท้ขใซๅไฝใฏใชใใใฎใจใใใ
(1) AB้ใฎ่ท้ขใซใคใใฆ, a ใ็จใใฆๆฑใใชใใใ albldo C
(2) ๅ่งๅฝข ACDB ใๆญฃๆนๅฝขใจใชใใจใ, a ใฎๅคใๆฑใใช
ใใใa = (
DA
y
0
y=xยฒ y
A
ไปฅไธ,ฮฑ ใฎๅคใฏ(2)ใงๆฑใใๅคใจใใใ
(3) ็ด็ท AD ใฎๆน็จๅผใๆฑใใชใใใ y = ( )
(4) 3็นO,A,Pใไธ็ด็ทไธใซใใใจใ็นPใฎๅบงๆจใๆฑใใชใใใ (
(5) (4)ใฎใจใ,ไธ่งๅฝขOAB ใจไธ่งๅฝข PABใฎ้ข็ฉๆฏใ็ฐกๅใชๆดๆฐใฎๆฏใงๆฑใใชใใใ
ไธ่งๅฝขOAB : ไธ่งๅฝข PAB (
P
H
20
T
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