问题
解答题
化简:
(1)2(2x-3y)-(3x+2y+1)
(2)-(3a2-4ab)+[a2-2(2a+2ab)].
答案
(1)原式=4x-6y-3x-2y-1
=(4-3)x-(6+2)y
=x-8y-1;
(2)原式=-(3a2-4ab)+[a2-4a-4ab]
=-3a2+4ab+a2-4a-4ab
=-2a2-4a.
化简:
(1)2(2x-3y)-(3x+2y+1)
(2)-(3a2-4ab)+[a2-2(2a+2ab)].
(1)原式=4x-6y-3x-2y-1
=(4-3)x-(6+2)y
=x-8y-1;
(2)原式=-(3a2-4ab)+[a2-4a-4ab]
=-3a2+4ab+a2-4a-4ab
=-2a2-4a.