Question

分式方程练习题要苏教版的,要有去分母去括号移项那些的,

Answer 1

3/2x=-2

3=-4x

x=-3/4

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

x(x+1)+2(x-1)=(x-1)(x+1)

x^2+x+2x-2=x^2-1

3x=1

x=1/3

(X+2)/X=(X+5)/(X+1)

X=1

100/(X+3)==200/(X-1)

x=-7

4/x+4/x=1

x=9

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

x=-3/2

(x+5)/(x+8)=(x+6)/(x+7)

x=-13/2

10/2x=10/x+1/3

x=-15

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

无解

2/(x-3)=3/(x-3)

无解

3/（x+4）=3/(x-4)

无解

30/(x+2)=20/(x-2)

x=10

20002x+10003x=(2000+1000)9

x=4

x/(4+x)=4/3

x=-16

90/X+120/X=35

X=6

9/x+15/20=1

X=36

80/1.5x+1=80/x+1/3

x=40

80／3x－1／3＝5

x=5

900／X＋30＝600／X

X＝-10

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

1/(x+1)-x^2/(x+1)(x+2)=-1

(x+2)/(x+1)(x+2)-x^2(x+1)(x+2)=-1

x+2-x^2=-(x+1)(x+2)

x^2-x-2=x^2+3x+2

4x=-4

x=-1

1.2x-3/x-1=（2x-4/2x+3）+1

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

(2x-3)(2x+3)=(4x-1)(x-1)

4x^2-9=4x^2-5x+1

5x=10

x=2

经检验：x=2是原方程的根.

2.（x2+2xy+y2/x2y+xy2）-（x2-2xy+y2/x2y-xy2）

=（x+y）^2/xy(x+y)-(x-y)^2/xy(x-y)

=(x+y)/xy-(x-y)/xy

=2y/xy

=2/x