Question

急!X+1分之X=3X+3分之2X,+1 X-1分之2=X的平方-1分之四 X的平方+X分之5-X的平方-X分之一=0

Answer 1

X(X+1)=(2X+1)/(3X+3)

X(X+1)-(2X+1)/(3X+3)=0

(3X-2X-1)/(3X+3)=0

(X-1)/(3X+3)=0

X=1

2/(X-1)=4/(X^2-1)

2/(X-1)-4/ [(X+1)(X-1)] =0

{2(X+1)-4}/ [(X+1)(X-1)] =0

{2X+2-4}/ [(X+1)(X-1)] =0

2(X-1)/ [(X+1)(X-1)] =0

2/ [(X+1)] =0,无解

5/(X^2+X) - 1/(X^2-X) = 0

5/[x(x+1)] - 1/ [(x+1)(x-1)] = 0

[5(x-1)-x] / [x(x+1)(x-1)] = 0

[4x-5] / [x(x+1)(x-1)] = 0

x=5/4