把多项式x3y-xy2+-x2y3先按x的升幂排列,再按y的降幂排列. 答案:按x的升幂排列:-xy2-x2y3+x3y. 按y的降幂排列:-x2y3-xy2+x3y+ 16.---Do you think that I can pass the exam to get to the key high school?---________.Everyone stands a chance.( )A.You never knowB.You got itC.Yes,I doD.You bet