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> 将分式xyx-y(x≠0,y≠0)中的x、y扩大为原来的3倍,则分式的值为()A.不变B.扩大为原来的3倍C.扩大为原来的9倍D.减小为原来的13-数学
将分式xyx-y(x≠0,y≠0)中的x、y扩大为原来的3倍,则分式的值为()A.不变B.扩大为原来的3倍C.扩大为原来的9倍D.减小为原来的13-数学
题目简介
将分式xyx-y(x≠0,y≠0)中的x、y扩大为原来的3倍,则分式的值为()A.不变B.扩大为原来的3倍C.扩大为原来的9倍D.减小为原来的13-数学
题目详情
将分式
xy
x-y
(x≠0,y≠0)
中的x、y扩大为原来的3倍,则分式的值为( )
A.不变
B.扩大为原来的3倍
C.扩大为原来的9倍
D.减小为原来的
1
3
题型:单选题
难度:中档
来源:不详
答案
用3x和3y分别代替式子中的x和y得:
class="stub"3x•3y
3x-3y
=
class="stub"9xy
3(x-y)
=3×
class="stub"xy
x-y
,
则分式的值扩大为原来的3倍.
故选B.
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题目简介
将分式xyx-y(x≠0,y≠0)中的x、y扩大为原来的3倍,则分式的值为()A.不变B.扩大为原来的3倍C.扩大为原来的9倍D.减小为原来的13-数学
题目详情
答案
则分式的值扩大为原来的3倍.
故选B.