(1)90°-45°23'3''(2)36°32'25''x6(3)43°26'3''-21°10'1''x2这些题目怎
1x2+2x4+3x6+4x8 ------------------------------- 2x3+4x6+6x9+
1X2+2X4+3X6+.50X100
1x2+2x4+3x6+.+1005x2010
(1x2+2x4+3x6+4x8)/(2x3+4x6+6x9+8x12)
1x2+2x4+3x6+4x8+5x10+.+20x40 怎么算?
1x2+2x4+3x6+4x8+5x10+.+20x40 简便计算
1x1-2x2+3x3-4x4+5x5-6x6.-100x100+101x101
2x3十4x6十6x9十8x12十10x15分之1x2十2x4十3x6十4x8十5x10.
1/1X2+1/2X3+1/3X4+1/4X5+1/5X6……1/2007X2008
1x2/1+2x3/1+3x4/1+4x5/1+5x6/1+6x7/1
1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+......1/2008x2009
1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+1/6x7