若多项式(m+2)x2+xy+y2﹣3x2﹣+6不含x2项,则2m2﹣m+1= .
(-1)2n =______;(-1)2n+1 =________;
(-0.1)3=_______;
(-5) 2 =________;
(-3)3 =__________;
(-1)9=_____;