第100页练习第1题答案
(1)6a2/12ab, 4b2/12ab,3c/12ab;
(2)9y/6x2y2,10x/6x2y2
第100页练习第2题答案
(1)1/x+1
=(x+1)(x-1)/(x+1)2(x-1),x-1/x2+2x+1
=x-1/(x+1)2
=(x-1)2/(x+1)2(x-1),1/x-1
=(x+1)2/(x+1)2(x-1)
(2)1/x-1
=x(x+1)/x(x+1)(x-1),1/x2-1
=1/(x+1)(x-1)
=x/x(x+1)(x-1),1/x2+x
=1/x(x+1)
=x-1/x(x+1)(x-1)