问题
解答题
求值:(1)
(2)
|
答案
(1)原式=
×1+x (x+2)(x-1)
=x+2 (x+1)(x-1)
=1 (x-1)2
=4.1 (
-1)21 2
(2)原式=
×y(y2-1) (x2-1)(y2-1)
=x+1 (x+y)y
=1 (x-1)(x+y)
=1 (-11-1)(-11+
)1 12
.1 131
求值:(1)
(2)
|
(1)原式=
×1+x (x+2)(x-1)
=x+2 (x+1)(x-1)
=1 (x-1)2
=4.1 (
-1)21 2
(2)原式=
×y(y2-1) (x2-1)(y2-1)
=x+1 (x+y)y
=1 (x-1)(x+y)
=1 (-11-1)(-11+
)1 12
.1 131