5.3分式的乘除
基础练习
1.(1)正确
(2)不正确1/[(x-1)2]
2.(1)1/a
(2)3c/ab2
(3)-x/49ay
(4)-25m2/n2
3.(1)(x+y)/y
(2)1/(a2+3a)
综合运用
4.(1)a/2b
(2)(2x-y)/[(2x+y)2]
5.(a+1)/(a-1)
5.4分式的加减
基础练习
1.(1)不正确,(x+1)/x
(2)正确
(3)正确
(4)不正确,x/(x-1)+1/(1-x)=1
2.(1)3/m
(2)2b/xy
(3)1
(4)2
3.(1)8/mn
(2)5/(x-1)
综合运用
4.(1)(x+2)/(x+1)
(2)1/(3k-2t)
5.原式=y+2,其值为-5/2
基础练习
1.(1)5a
(2)a2b2
2.(1)(a+b)/ab
(2)-1/6x
(3)(4ab+b)/4a2
3.(1)4m/(m2-n2)
(2)-1/(x+1)
(3)-1/(x2+x)
(4)1/a-1
4.-2/(m+3);-2
综合运用
5.(1)-1
(2)-(6x-4)/(x2-4)
6.600/(x-2)-600/x=1200/(x2-2x)(元)
5.5分式方程
基础练习
1.①③
2.2-3(1-x)=0
3.(1)x=3
(2)x=2/3
4.(1)无解
(2)x=-5/4
综合运用
5.(1)无解
(2)x=1/2
6.设原计划每天铺设管道x(m),则100/x+(300-100)/x(1+25%)=5,解得x=52
*7.x=m,验证略
基础练习
1.x+20,5000/(x+20),
4800/x=5000/(x+20)
2.(1)U/R
(2)S/πr
3.B
4.设成本价为x元,则(150-x)/x=25%,解得x=120
5.2S/(a+b)
6.设原计划每天种树x棵,则480/x-480/[x(1+1/3)]=4,解得x=30