1/(x+8)-1/(x+9)=1/(x+6)-1/(x+7)为什么可以转换成:1/(x+6)(x+7)=1/(x+8)
1个回答
通分
[(x+7)-(x+6)]/(x+6)(x+7)=[(x+9)-(x+8)]/(x+8)(x+9)
1/(x+6)(x+7)=1/(x+8)(x+9)
相关问题
1、5x6/1+6x7/1+7x8/1+8x9/1+9x10/1+……+19x20/1
(6/1+7/1+8/1)x(7/1+8/1+9/1)-(6/1+7/1+8/1+9/1)x(7/1+8/1)
1/1x2x3x4+1/2x3x4x5+1/3x4x5x6+1/4x5x6x7+1/5x6x7x8+1/6x7x8x9+
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
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
分式方程.x/(x-2)+(x-9)/(x-7)=(x+1)/(x-1)+(x-8)/(x-6)
解方程:[x/x−2+ x−9x−7= x+1x−1+ x−8x−6].
帮帮忙解答一道奥赛题1/2x3+1/3x4+1/4x5+1/5x6+1/6x7+1/7x8+1/8x9
(1+1/6)X(1+1/7)X(1+8)X(1+1/9)X(1/10)简算快