(1-1/2x4)x(1-3/3x5)x(1-5/4x6)x(1-7/5x7)x(1-9/6x8)x(1-11/7x9)x(1-13/8x10)x(1-15/9x11)
额,我没有打括号啦
(1-1/(2x4))x(1-3/(3x5))x(1-5/(4x6))x(1-7/(5x7))x(1-9/(6x8))x(1-11/(7x9))x(1-13/(8x10))x(1-15/(9x11))
还有一题
(1+2)/2x(1+2+3)/(2+3)x(1+2+3+4)/(2+3+4)x...x(1+2+...+2001)/(2+3+...+2001)
(1-1\/2x4)x(1-3\/3x5)x(1-5\/4x6)x(1-7\/5x7)x(1-9\/6x8)x(1-11\/7x9)x...
=(1-6)X(1-15)X(1-27\/2)X(1-63\/5)X(1-4)X(1-27\/7)X(1-15\/4)X(1-11\/3)=5X14X(1-27\/2)X(1-63\/5)X3X(1-27\/7)X(1-15\/4)X(1-11\/3)=5X(1-63\/5)X2X(1-27\/2)X7X(1-27\/7)X3X(1-11\/3)X(1-15\/4)=(-58)X(-25)X...
(1-2X4分之3)X(1-3X5分之3)X(1-4X6分之3)X(1-5X7分之3)X(1-6X8分之...
我的 (1-2X4分之3)X(1-3X5分之3)X(1-4X6分之3)X(1-5X7分之3)X(1-6X8分之3)X(1-7X9分之3)X(1-8X10 (1-2X4分之3)X(1-3X5分之3)X(1-4X6分之3)X(1-5X7分之3)X(1-6X8分之3)X(1-7X9分之3)X(1-8X10)X(1-9X11分之3... (1-2X4分之3)X(1-3X5分之3)X(1...
(1-1\/2x4)x(1-3\/3x5)x……x(1-15\/9x11)用简便方法计算p
=(1-6)x(1-15)x(1-27\/2)x(1-63\/5)x(1-4)x(1-27\/7)x(1-15\/4)x(1-11\/3)=5x14x(1-27\/2)x(1-63\/5)x(-3)x(1-27\/7)x(1-15\/4)x(1-11\/3)=-58x25x20x8x(1-15\/4)=58X25x20x22 =63800
(1-3\/2X4)X(1-3\/3X5)X(1-3\/4X6)X(1-3\/5X7)…
原式=101\/(4X98)=101\/392
(1-3\/2x4)x(1-3\/3X5)x(l一3\/4X6)X……X(1-3\/7X9)
原式=(1x5)\/(2x4)x(2x6)\/(3x5)x(3x7)\/(4x6)x(4x8)\/(5x7)x(5x9)\/(6x8)x(6x10)\/(7x9)=(1X2X3X4X5X6)X(5X6X7X8X9X10)\/[(2X3X4X5X6X7)X(4X5X6X7X8X9)]=(2X3X4X5X6X7X8X9)X(5X6X10)\/[(2X3X4X5X6X7X8X9)X(4X5X6X7)]=5X6X10\/(4X5X6X7)...
(1-1\/2)X(1-1\/3)X(1-1\/4)X(1-1\/5)X...X(1-1\/2011)X(1-1\/2012) 具体回 ...
(1-1\/2)X(1-1\/3)X(1-1\/4)X(1-1\/5)X...X(1-1\/2011)X(1-1\/2012)=(1\/2)x(2\/3)x(3\/4)x(4\/5)x(5\/6)...x(2010\/2011)x(2011\/2012)=1\/2012(中间项的分子分母可以约掉)(1) 2※(-4)=2x(-4)+1=-7 (2) -3※5※0=(-3x(5)+1)※0=-14x0+1=1 (3...
...1+1\/2x4)x(1+1\/3x5)x.x(1+1\/98x100)x(1+1\/99x101)=?
我只算到这一步,还没有完全算出答案:(1+1/1×3)×(1+1/2×4)x(1+1/3×5)×.×(1+1/98×100)×(1+1/99×101)=(1×3+1/1×3)×(2x4+1/2x4)×(3x5+1/3x5) × (4x6+1/4x6)×…… ×(98x100...
(1-1\/2)X(1-1\/3)X...X(1-1\/19)X(1-1\/20)等于多少
(1-1\/2)X(1-1\/3)X...X(1-1\/19)X(1-1\/20)=1\/2X2\/3X...X18\/19X19\/20 =1\/20
(1+1\/1x3)(1+1\/2x4)(1+1\/3x5)(1+1\/4x6)x..x(1+1\/97x99)(1+1\/98x100...
(4\/1×3)(9\/2×4)(16\/3×5)(25\/4×6)……(9801\/98×100)=(2��×3��×4��×5��×……×99��)\/(2×4×3×5×4×6×……×97×99×98×100)=(2×3×4×...×99)\/(2×3×4×...×98)...
1\/1x3+1\/2x4+1\/3x5+1\/4x6+1\/5x7+1\/6x8
解答: ∵2*【1\/1x3+1\/2x4+1\/3x5+1\/4x6+...+1\/100x102】 =1\/1-1\/3+1\/2-1\/4+1\/3-1\/5+1\/4-1\/6+...+1\/99-1\/101+1\/100-1\/102 =1+1\/2-1\/101-1\/102 =(101*102+101*51-102-101)\/101*102 =15250\/10302 =7625\/5151 ∴ 1\/1x3+1\/2x4+1\/3x5+1\/...