香港美食2017

標題:

2題簡單MATH QUESTION(中2)

• 我想問下係香港邊到可以買到 Wave HT-111既噴筆@1@
• 月亮代表我的心(歌)
• 係邊度可以有日本史既線上閱讀呢--~~^^

 

此文章來自奇摩知識+如有不便請留言告知

發問:

1. PQ2 +QR 2 = 16 PQ+QR=? 2.GIVEN THAT THE AREA OF A SQUARE WOODEN BOARD IS 125CM2, FIND THS LENGTH OF THER DIAGONAL OF THE BOARD.( LEAVE YOUR ANSWER IN A SQUARE ROOT FORM) 更新: 第一題果到，PQ=QR

最佳解答:

Let x = PQ =QR X^2 + X^2 =16 2X^2 =16 X^2=8 X= sqrt( 8) PQ +QR = 2X = 2 sqrt (8) = 4 sqrt( 2) 2. Let y cm be the side of the square. y^2 =125 Let z cm be the length of the diagonal z^2= y^2 + y^2 z^2 =2 y^2 z^2 =2 * 125 z^2 =250 z= sqrt(250)

其他解答:

我有兩個擬問?? PQ2=(PQ)^2...??? QR 2=(QR)^2...??? IF YES, THEN: (PQ)^2+(QR)^2=16 (PQ+QR)^2-2PQ^2R=16 PQ+QR=開方（16-2PQ^2R）