PP-PS1完整詳解版-V2[1].0

Anone bone ctwo dthree emorethanthree c 2and4 66

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­ 28. 3377­!­item­!­187;#058&003297 If xy = 1, what is the value of 2^[(x+y)^2] / 2^[(x­y)^2] ? (A) 2 (B) 4 (C) 8 (D) 16 (E) 32 ­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­ 作作作作D 2 2 2 2 2 2 2 2( x + y ) 2( x + 2 xy + y ) xr r −s = ( x2 −2 xy+ y2 ) = 2 x + 2 xy + y − x + 2 xy − y = 24 xy 作作作作作作 ,由由 =x 2 2( x − y ) xs 2 4 xy=1,作the value= 2 =16 ­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­ 29. 3426­!­item­!­187;#058&003323 The value of the expression above is closest to which of the following? (A) 0.0001 (B) 0.001 (C) 0.1 (D) 1 (E) 10 30. 3528­!­item­!­187;#058&003455 A furniture dealer purchased a desk for $150 and then set the selling price equal to the purchase price plus a markup that was 40 percent of the selling price. If the dealer sold the desk at the selling price, what was the amount of the dealer's gross profit from the purchase and the sale of the desk? (A) $40 (B) $60 (C) $80 (D) $90 (E) $100 ­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­ 作作作作E 作作作作selling price=the purchase price+ 40%selling price selling price =150+0.4x selling price 0.6 selling price=150 selling price=250, the gro...
View Full Document

Ask a homework question - tutors are online