E is the midpoint, so the area of triangle CED is equal to triangle BED, and because B is the midpoint of AC, the area of triangle ABD is equal to CBD, which is equal to 20.

Let the side length of a square row be a, the area of a square row be A*A= 10, the radius of a circle be a, and the area of a circle be 3.14 * a, then the area of a circle be 3.14 */kloc-0 = 3/kloc-0.

Page 38

One, 15 7X=35

X = 35 ÷ 65438+7/05

X=75

Do it.

1, 320 ÷ 2× 5 = 800 copies

2320÷4×3 = 240 copies

Page 39

X=20

There are 20 people.