问题
填空题
计算题 (1)(-1)2008+(π-3.14)0-(-
(2)(-x-y)(x-y)+(x+y)2. |
答案
(1)原式=1+1-9=2-9=-7;
(2)原式=(-y)2-x2+x2+2xy+y2=2y2+2xy.
计算题 (1)(-1)2008+(π-3.14)0-(-
(2)(-x-y)(x-y)+(x+y)2. |
(1)原式=1+1-9=2-9=-7;
(2)原式=(-y)2-x2+x2+2xy+y2=2y2+2xy.