问题:
已知2x b+5y 3a与-4x 2ay 2-4b是同类项,则b a的值为
[ ]
A.2
B.-2
C.1
D.-1
已知2x b+5y 3a与-4x 2ay 2-4b是同类项,则b a的值为
B.-2
C.1
D.-1
[ ]
A.2 B.-2
C.1
D.-1
参考答案: