Question

4b^2-1分之3-6b 和 x+2分之2x+4 怎么进行分式约分

Answer 1

(3-6b)/(4b^2-1)

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

=-3/(2b+1)

(2x+4)/(2+x)

=2(x+2)/(x+2)

=2

a+2b=0

a/b=-2

(a^2+2ab-b^2)/(2a^2+ab+b^2)

分子分母同时除以b^2

=(a/b^2+2a/b-1)/(2a/b^2+a/b+1)

=(4-4-1)/(8-2+1)

=-1/7