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.

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