题目

(1)3x^2-[7x-(4x-3)-2x^2]
(2)(2xy-y)-(-y+yx)
(3)5(a^2b-3ab^2)-2(a^2b-7ab^2)
(4)11x^2+4x-1-x^2-4x-5
(5)(2x^4-4x^3y-2x^2y^2)-(x^4-2x^2y^2+y^3)+(-x^4+4x^3y-y^3)
注:x^2表示x的2次方,x^4表示x的4次方.

提问时间：2021-04-01

答案

俺不是高手,俺问问是因式分解么?(1)3x^2-[7x-(4x-3)-2x^2]=3x^2-7x+4x-3+2x^2=5x^2-3x-3(2)(2xy-y)-(-y+yx)=2xy-y+y-xy=xy(3)5(a^2b-3ab^2)-2(a^2b-7ab^2)=5a^2b-15ab^2-2a^2b+14ab^2=3a^2b-ab^2(4)11x^2+4x-1-x^2-4...