(1+1/2)X(1-1/2)X(1+1/3)X(1-1/3)X……X(1+1/9)X(1-1/9)=?
1个回答
(1+1/2)X(1-1/2)X(1+1/3)X(1-1/3)X……X(1+1/9)X(1-1/9)
=3/2X4/3X……x10/9x1/2x2/3x……x8/9
=10/2x1/9
=5/9
相关问题
(1) x/x+1-2/3x-3=1; (2) 1/9x-3-x/3x-1=2/3
1、1/2x=(95-x)x1/3 2、(1/2-9)X1/5=X-9 3、1/4x+(2800-x)X1/5=2800
1/x(x+1)+ 1/(x+1)(x+2) + 1/(x+2)(x+3)+...+1/(x+8)(x+9)
12/1-9x^2-3x+1/3x-1=1-3x/1+3x
解方程1/x(x+1)+1/(x+1)(x+2)+...+1/(x+8)(x+9)=2x+3/x(x+9)
解方程(1)1/x+1 +3/2-x=0 (2)12/1-9x^2-3x+1/3x-1=1-3x/1+3x
-1/1x2-1/2x3-1/3x4-.-1/9x10
1/1*2x+1/2*3x+1/3*4x+1/4*5x+1/6*7x+1/7*8x+1/8*9x+1/9*10x=1/1
计算:1/x(x+1)+1/(x+1)(x+2)+1/(x+2)(x+3)+……+1/(x+9)(x+10)
(1-1/2)x(1-1/3)x(1-1/4)x...x(1-1/9)x(1-1/10)