新机经，会是高频的，注意啊!

yuezhuo

1. 长方形ABCD, 中间(任意）有一点o, 连接OA,OB,OC,OD,其长度分别用X,Y,Z,W来表示，求W^2如何表示？

高手们，怎么解答!
2. A section of wire weighs XXX grams, cut them into two part with lengther of XXXcm, the mass is unformly distributed. What\\\'s the mass of 1 cm wire.

yuezhuo

to xiaoyayah

3x!

good luck!

xiaoyayah

1.由o向各边作垂线长为abcd
w^2=a^2+b^2=x^2-C^2+Z^2-d^2=x^2+Z^2-y^2
2