用反证法证明：方程ax2bxc0，且a，b，c都是奇数，则方

更新 2022-09-03
科目数学
题型选择题
难度中等
浏览 1598

挑错有奖

用反证法证明：“方程ax²+bx+c=0，且a，b，c都是奇数，则方程没有整数根”正确的假设是方程存在实数根x₀为（）

A．整数

B．奇数或偶数

C．正整数或负整数

D．自然数或负整数

登录免费查看答案和解析

相关试题

Laura is 11﹣year﹣old girl． She is good at playing _____ guitar．（　　）

A．

/； a

B．

an； /

C．

an； the

D．

a； an

题型：未知
难度：未知

收藏答案/解析

Julie has made great progress． How did she make it？

She works much harder than before． She says if she doesn't catch up， she will be left out ．（　　）

A．	be angry	B．	fall behind
C．	give in	D．	get excited

题型：未知
难度：未知

收藏答案/解析

He was down in the mouthbecause he missed his plane．（　　）

A．

unhappy

B．

happy

C．

glad

D．

relaxed

题型：未知
难度：未知

收藏答案/解析

I'm doing a survey． Could you tell me ？

Sure． I usually go to work at 7：00 am．（　　）

A．	when do you go to work
B．	how you go to work
C．	when you go to work

题型：未知
难度：未知

收藏答案/解析

is quite easy for people to find any place in the world with the help of online maps．（　　）

A．

That

B．

C．

One

题型：未知
难度：未知

收藏答案/解析

推荐套卷

热门套卷