习题9.1第1题答案
解:(1)该边上的高是2S/a(m);
(2)这个圆柱的高是a3/πr2 (m);
(3)应买b/a箱;
(4)n/am(h)
习题9.1第2题答案
解:(1)当2x-3=0,即x=3/2时,分式无意义;
(2)当5x+10=0,即x=-2时,分式无意义
习题9.1第3题答案
(1)y2
(2)x+2
(3)4a2x
(4)ab+b2
习题9.1第4题答案
解:(1)0.1x-0.2y/0.5x+0.3y
=10(0.1x-0.2y)/10(0.5x+0.3y)
=x-2y/5x+3y;
(2)1/2a-1/3/1/4b+1/3
=12(1/2a-1/3)/12(1/4b+1/3)
=6a-4/3b+4
习题9.1第5题答案
习题9.1第6题答案
红姐
(1)-15x/20x2=-2/4x;
(2)-2ac2/-14a2bc=c/7ab;
(3)x-y/(y-x)3=1/(x-y)2;
(4)x2-9/6-2x=(x+3)(x-3)/-2(x-3)=-x+3/2
(5)a2+2ab+b2/a2-b2=(a+b)2/(a+b)(a-b)=a+b/a-b;
(6)x2+1/x-x2=(x-1)(x+1)/x(x-1)=-x+1/x
习题9.1第7题答案