Question

化简下列各题
①（6m²-4m-3）+（2m²-4m+1）；
②3x2-[5x-(

1

2

x-3)+2x2]．

Answer 1

①原式=6m²-4m-3+2m²-4m+1=8m²-8m-2；
②原式=3x²-（5x-

1

2

x+3+2x²）=3x²-5x+

1

2

x-3-2x²=x2-

9

2

x-3．