题目

化简： （1） （2） 答案：8a+5b−(3a+4b)=8a+5b-3a-4b =5a+b； 5xy2+3x2y−2(3xy2+x2y)= 5xy2+3x2y−6xy2−2x2y= x2y−xy2 .---How did you find my new dress, Jim? ---_______. A. Go to the tailor’s                                   B. Oh, it fits me perfectly. C. Oh, very nice, indeed                                D. No, I didn’t find it.