Question

若单项式2A的3-N次方B的M-1次方与B的负M-1次方A³是同类项,

Answer 1

3-n=3

n-0

m-1=-(m-1)

m=1

MN+M²-（-2MN+n²）+（N²+M²)=0+1-0+1=2