问题
计算题
(1)4y﹣[3y﹣(3﹣2y)]﹣2;
(2)2(2x2﹣xy)﹣(x2﹣xy﹣6).
答案
解:
(1)4y﹣[3y﹣(3﹣2y)]﹣2
=4y﹣[3y﹣3+2y]﹣2
=4y﹣3y+3﹣2y﹣2
=(4﹣3﹣2)y+(3﹣2)
=﹣y+1;
(2)2(2x2﹣xy)﹣(x2﹣xy﹣6)
=4x2﹣2xy﹣x2+xy+6
=3x2﹣xy+6.
(1)4y﹣[3y﹣(3﹣2y)]﹣2;
(2)2(2x2﹣xy)﹣(x2﹣xy﹣6).
解:
(1)4y﹣[3y﹣(3﹣2y)]﹣2
=4y﹣[3y﹣3+2y]﹣2
=4y﹣3y+3﹣2y﹣2
=(4﹣3﹣2)y+(3﹣2)
=﹣y+1;
(2)2(2x2﹣xy)﹣(x2﹣xy﹣6)
=4x2﹣2xy﹣x2+xy+6
=3x2﹣xy+6.