帮帮忙解答一道奥赛题1/2x3+1/3x4+1/4x5+1/5x6+1/6x7+1/7x8+1/8x9
4个回答
原式=1/2-1/3+1/3-1/4+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9
=1/2-1/9
=7/18
相关问题
1/1x2x3x4+1/2x3x4x5+1/3x4x5x6+1/4x5x6x7+1/5x6x7x8+1/6x7x8x9+
简算题:1x2/1+2x3/1+3x4/1+4x5/1+5x6/1+6x7/1+7x8/1+8x9/1
1/4x-1/2=3/4;7x-5/4=3/8;2x-1/6=5x+1/8;1/2x-7=9x-2/6;1/5x-1/2
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
解方程 x- 5 6 = 1 9 2 7 +x= 3 4 3x-x=1.8 5 9 -x= 1 6 .
1.48x(3/4-1/6)2.3/4x4/9+5/9x3/43.1/5x1/8+7/8x1/54.12x(1/2+1/
初中数学题1/4y=5y+1 7x+6=-6x 3/5y-8=1 -2x-3=-x+3 2x-1/8=x/7+1/2 -
(1)5+2x=1 (2)8-x=3x+2 (3)10x-3=9 (4)6x-7=4x-5 (5)1/2x-6=3/4x
x/6=5/12,1/3:1/4=1/6:x,x:0.9=2.7:1.8
4X-1.8=4.8.2.5X-2.5=7.5.5X-1.8=4.3X+1.5=6.求X