1、2分之1x的m次方+5分之2x的m-1次方-0.1-0.4x的m-1次方+0.2x的m次方+5
=(x^m)/2+2x^(m-1)/5-0.1-2^(m-1)/5+(x^m)/5+5
=(x^m)/2+(x^m)/5+5-0.1
=7(x^m)/10+5-1/10
=7(x^m)/10+49/10
=[7(x^m)+49]/10

2、4xy－﹙x的平方＋y的平方﹚－[4xy－2分之1﹙2x的平方－y的平方﹚]
=4xy－﹙x²＋y²﹚－[4xy－﹙2x²－y²﹚/2]
=4xy－x²－y²－4xy + x²－y²/2
=－y² －y²/2
=－3y²/2