Question

把下列各组分式通分:(1)1/4a2b,2/3ab2;(2)1/a,1/b,1/c;(3)x/2(x+1),1/x2-x

Answer 1

(1)

公分母是12a^2b^2

1/4a^2b=3b/12a^2b^2

2/3ab^2=8a/12a^2b^2

(2)

公分母是abc

1/a=bc/abc

1/b=ac/abc

1/c=ab/abc

(3)

公分母是2x(x+1)(x-1)

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

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

(4)

公分母是x(x-1)

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

6/(x-1)=6x/x(x-1)

如果不懂,祝学习愉快!