问题
解答题
计算: (1)(-
(2)(x+y-1)(x-y+1) |
答案
(1)原式=-(
•b a b2 a
)2•a b2
=-b2 a
;b4 a3
(2)原式=[x+(y-1)][x-(y-1)]=x2-(y-1)2=x2-y2+2y-1.
故答案为-
、x2-y2+2y-1.b4 a3
计算: (1)(-
(2)(x+y-1)(x-y+1) |
(1)原式=-(
•b a b2 a
)2•a b2
=-b2 a
;b4 a3
(2)原式=[x+(y-1)][x-(y-1)]=x2-(y-1)2=x2-y2+2y-1.
故答案为-
、x2-y2+2y-1.b4 a3