问题
解答题
(1)先化简,再求值:(x-
(2)计算:-32+(-3)-2+(2×106)×(1×10-5)+(π-3)0. |
答案
(1)原式=
÷x2 x+1
=x2 x2-1
•x2 x+1
=x-1,(x+1)(x-1) x2
将x=
+1时,原式=2
+1-1=2
;2
(2)原式=-9+
+2×10+1=121 9
.1 9
(1)先化简,再求值:(x-
(2)计算:-32+(-3)-2+(2×106)×(1×10-5)+(π-3)0. |
(1)原式=
÷x2 x+1
=x2 x2-1
•x2 x+1
=x-1,(x+1)(x-1) x2
将x=
+1时,原式=2
+1-1=2
;2
(2)原式=-9+
+2×10+1=121 9
.1 9