3x²+4-5x²)+（-x³-3+2x²）化简

(3x²+4-5x²)+（-x³-3+2x²）=3x²+4-5x²-x³-3+2x²=1-x³We often discuss after class football news动词原形? 再问： 动词填空：Doing moring exercises ( ) (heip) us () (get)ready for the day 再答： helpful Doing moring exercises (helpful)us (get)ready for the day