下列式子：2a2b，3xy-2y2， a2+b22 ，4，-m， x+yz2x ， aπ ，其中是单项式的有

题干

下列式子：2a²b，3xy-2y²，

a

2

+

b

2

，4，-m，

x

+

y

z

2

x

，

a

π

，其中是单项式的有（）

A：2个

B：3个

C：4个

D：5个

上一题下一题 0.0难度选择题更新时间:2019-12-23 01:17:33

C

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