英文奥数求面积as the following picture shows ,the area of the isoceles triangle is 140 c㎡ ,the two equal sides are 20 cm each ,point on the third side at the random ,the length of the two vertical lines are acm and bcm .question:what length

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英文奥数求面积as the following picture shows ,the area of the isoceles triangle is 140 c㎡ ,the two equal sides are 20 cm each ,point on the third side at the random ,the length of the two vertical lines are acm and bcm .question:what length

英文奥数求面积as the following picture shows ,the area of the isoceles triangle is 140 c㎡ ,the two equal sides are 20 cm each ,point on the third side at the random ,the length of the two vertical lines are acm and bcm .question:what length
英文奥数求面积
as the following picture shows ,the area of the isoceles triangle is 140 c㎡ ,the two equal sides are 20 cm each ,point on the third side at the random ,the length of the two vertical lines are acm and bcm .question:what length is "a+b"?

英文奥数求面积as the following picture shows ,the area of the isoceles triangle is 140 c㎡ ,the two equal sides are 20 cm each ,point on the third side at the random ,the length of the two vertical lines are acm and bcm .question:what length
如图

(a+b)x20/2=140
a+b=14

20*a/2+20*b/2=140 ; a+b=14

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