9分之5x=[x-2]乘以5分之2-搜答案-搜狗做题网

(1+4/5)x=9/16x=5/16(1-7/15)x=14/25x=21/10(1+3/4)x=5/6x=10/21

（2x-5）/(x-2)(x-3)-1/(x-3)=（2x-5）/(x-2)(x-3)-(x-2)/(x-2)(x-3)=（2x-5-x+2)/(x-2)(x-3)=（x-3)/(x-2)(x-3)=

题目应是　已知y=x的平方-1分之x的平方-2x+1除以x+1分之x的平方-x乘以5x,试说明在代数式有意义的情况下,不论x取何值,y的值都不变y=(x^2-2x+1)/(x^2-1)÷(x^2-x)

0.9(X-4)=19.8x-4=22;x=26;计算'49.5乘以10又5分之3-(50-2分之1)乘以5分之3=49.5×(10+3/5)-49.5×(3/5)=49.5×(10+3/5-3/5)

应该是0.

原式=[(1-1分之x+5)-(1-1分之x+4))+(1-1分之x+3)-(1-1分之x+2)]*[(x+3)(x+5)]\(x^2+7x+13)=[(1分之x+2)-(1分之x+3)+(1分之x+

2x/5-8/15=4/5×1/22x/5-8/15=2/52x/5=2/5+8/152x/5=14/15x=14/15÷2/5x=7/3

[(x+2)+1]/(x+2)-[(x+1)+1]/(x+1)=[(x+4)+1]/(x+4)-[(x+3)+1]/(x+3)1+1/(x+2)-1-1/(x+1)=1+1/(x+4)-1-1/(x+

108分之91

17减百分之120x=585-6x=256x=60x=10x－百分之12x=2.8160.88x=2.816x=3.25分之4×4分之1－2分之1x=20分之14－10x=1x=3/10x＋9分之7x

x分之一+5分之3乘以x分之一=3分之2除以61/X+3/5*1/X=（2/3）/61/X+3/5*1/X=1/98/5*1/X=1/98/5*1/X=1/9X=8/5*9=72/5

2*0.2x-3*0.3x+5*0.4x=0.3*50.4x-0.9x+2x=1.51.5x=1.5x=1

方程可化为：8分之9X=5分之64得x=45分之512

X^2*X^2n*Y^2n=X^2*(XY)^2n=(-5)^2(-5*1/5)^2n=25*1^2n=25手打不容易,再问：是整的还是负的再答：是正的！

由题意得：5x+12×2/3=25/35x+8=3/255x=25/3-85x=1/3x=1/15

2x分之x^2乘以x^2+5x+6分之x^3-3x^2除以x^2+2x-3分之x^3-9x=x²/2x*(x³-3x²)/(x²+5x+6)÷(x³-

1乘以2分之x+2乘以3分之x+.+2012乘以2013分之x=2012(1-1/2+1/2-1/3+……+1/2012-1/2013)x=2012(1-1/2013)x=20122012/2013x

(4x/z)-(5y/z)=-2……①(x/z)-(4y/z)=3……②方程②×4得,(4x/z)-(16y/z)=12……③①-③得,11y/z=-14,∴y/z=-14/11代入②得,(x/z)-