问题
解答题
化简:
(1)4a2+3b2+2ab-4a2-4b2;
(2)3x2-[7x-(4x-3)-2x2].
答案
(1)原式=2ab-b2;
(2)原式=3x2-7x+4x-3+2x2=5x2-3x-3.
化简:
(1)4a2+3b2+2ab-4a2-4b2;
(2)3x2-[7x-(4x-3)-2x2].
(1)原式=2ab-b2;
(2)原式=3x2-7x+4x-3+2x2=5x2-3x-3.