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椭圆的面积
椭圆
x
2
a
+
y
2
b
=
1
\dfrac{x^2}{a}+\dfrac{y^2}{b}=1
a
x
2
+
b
y
2
=
1
的面积
S
=
π
a
b
S=\pi ab
S
=
π
a
b
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