问题
解答题
(1)计算:
(2)化简:(
|
答案
(1)
+15×(-16
)-(-2)21 3
=4+(-5)-4…(3分)
=-5;…(5分)
(2)(
-x2 x+1
)•1 x+1 x2 x2-x
=
•x2-1 x+1
…(1分)x2 x2-x
=
•(x+1)(x-1) x+1
…(3分)x2 x(x-1)
=x.…(5分)
(1)计算:
(2)化简:(
|
(1)
+15×(-16
)-(-2)21 3
=4+(-5)-4…(3分)
=-5;…(5分)
(2)(
-x2 x+1
)•1 x+1 x2 x2-x
=
•x2-1 x+1
…(1分)x2 x2-x
=
•(x+1)(x-1) x+1
…(3分)x2 x(x-1)
=x.…(5分)