问题
解答题
计算:
(1)11x2+4x-x2-3x;
(2)a2b-2ab2-ab2+3b2a:
(3)4y2-[5y-(2y+1)-y2].
答案
(1)11x2+4x-x2-3x=10x2+x;
(2)a2b-2ab2-ab2+3b2a=a2b;
(3)4y2-[5y-(2y+1)-y2]=4y2-[5y-2y-1-y2]=4y2-5y+2y+1+y2=5y2-3y+1.
计算:
(1)11x2+4x-x2-3x;
(2)a2b-2ab2-ab2+3b2a:
(3)4y2-[5y-(2y+1)-y2].
(1)11x2+4x-x2-3x=10x2+x;
(2)a2b-2ab2-ab2+3b2a=a2b;
(3)4y2-[5y-(2y+1)-y2]=4y2-[5y-2y-1-y2]=4y2-5y+2y+1+y2=5y2-3y+1.