Question

下列說(shuō)法不正確的是··················································································· （　　）

A．已知關(guān)于x、y的方程是二元一次方程冊(cè)，則a=3,b=-2

B．若與是同類項(xiàng)，則a=9或a=-9

C．若a:b=2:3,b:c=2:3,則a:b:c=4:6:9

D．方程有無(wú)數(shù)個(gè)解，其中有2組正整數(shù)解

 

Answer 1

答案：B
解析：

B

提示：

逐個(gè)檢驗(yàn)