x分之1-x

衡泳闹12972 - x分之1 - x+2=x - 2分之1 -
冀饶服13988808838 ______[答案] 2x+1/x-9/2=0 2x^2-9/2x+1=0 2(x^2-9/2x+1/2)=0 2(x-1/4)(x-2)=0 x=1/4或2

衡泳闹1297x - 2分之1 +3 = 2 - x分之1 - x -
冀饶服13988808838 ______[答案] 如果你确定右边的是X分之1的话步骤如下: X+2分之1=-2X 3X=负2分之1 X=负6分之1

衡泳闹1297x - 3分之1 - 6+2x分之1 - x(x - 3)分之1 - (6+2x)分之1 - x -
冀饶服13988808838 ______[答案] (x-3)分之1-(6+2x)分之1-x =1/(x-3) + (x-1)/2(x+3) =[2(x+3)+(x-1)(x-3)]/[2(x+3)(x-3) =(2x+6+x²-4x+3)/[2(x+3)(x-3)] =(x²-2x+9)/(2x²-18)

衡泳闹1297解方程:x - 2分之1+3=2 - x分之1 - x -
冀饶服13988808838 ______[答案] x-2分之1+3=2-x分之1-xx-1/2+3=2-1/x-xx+1/x+x=2+1/2-32x+1/x=-1/22x²+1=-x/2x²+x/4=-1/2x²+x/4+(1/8)=1/64-1/2(x+1/8)²=-31/64无实数解x+1/8=±√31i/8x=-1/8±√31i/8

衡泳闹1297解方程:x - 2分之1 - x - 2 - x分之1= - 2
冀饶服13988808838 ______ (x-2)分之(1-x)-(2-x)分之1=-2 (x-2)分之(1-x)+(x-2)分之1+(x-2)分之2(x-2)=0 (x-2)分之(1-x+1+2x-2)=0 (x-2)分之x=0 x-2≠0且x=0 x≠2且x=0 即x=0

衡泳闹1297方程x - 2分之1加上2等于2 - x分之1 - x的解为() -
冀饶服13988808838 ______[选项] A. 0 B. 2 C. -2 D. 有过程说明下怎么算的?

衡泳闹1297若x是不等于1的实数,我们把1 - x分之1称为x的差倒数,如2的差倒数是1 - 2分之1= - 1, - 1的差倒数是1 - ( - 1)分之1=2分之1,现已知x1= - 3分之1,x2是x1的差倒数,... -
冀饶服13988808838 ______[答案] 用数学归纳法: x2=3/4,x3=4,x4=-1/3,x5=3/4,x6=4,x7=-1/3. 又因为2012=670*3+2, 所以,x2012=3/4.

衡泳闹1297求y=x - 1分之x+1的导数 -
冀饶服13988808838 ______[答案] y=(x-1)/(x+1)=(x-1+2)/(x-1)=1 +2/(x-1) y'=[1+2/(x-1)]' =1'+[2/(x-1)]' =0+[(-1)*2/(x-1)²](x-1)' =2/(x-1)² 或者直接利用公式(u/v)'=(u'v-uv')/v²来 y'=[(x+1)'(x-1)-(x-1)'(x+1)]/(x-1)² =[(x-1)-(x+1)]/(x-1)² =2/(x-1)²

衡泳闹1297已知x分之1 - y分之1=x - y分之一,求y分之x+x分之y的值 -
冀饶服13988808838 ______[答案] x分之1-y分之1=x-y分之一 (y-x)/xy=1/(x-y) (x-y)²=-xy x²-2xy+y²=-xy x²+y²=xy x/y+y/x=1

衡泳闹1297化简:x分之1+x(x - 1)分之1 -
冀饶服13988808838 ______[答案] x分之1+x(x-1)分之1 =(x-1+1)/[x(x-1)] =1/(x-1)