习题9.2第1题答案
(1)2/3a;
(2)y2d/4c;
(3)a/2;
(4)3/2xy
习题9.2第2题答案
解:(1)原式=(x-1)(x-1)/x(x-1)·x(y-1)/y-1
=x+1;
(2)原式=1/(x-y)2·x-y/x+y
=1/x2-y2;
(3)原式=x(y-x)·xy/x-y
=-x2y;
(4)原式=x-3/x(x+1)·1/(x-3)2
=1/x(x+1)(x-3)
=1/x3-2x2-3x
习题9.2第3题答案
解:(1)原式=(-xy/a)·a2/x2=-ay/x
习题9.2第4题答案
习题9.2第5题答案
解:(1)原式=2x+7- (x+3)/3x+1
=2x+7-x-3/3x+1=x+4/3x+1
(2)原式=3c/c-d+3d+c/c-d
=3c+3d+c/c-d
=4c+3d/c-d