问题
解答题
先化简,再求值5
|
答案
5
-x 5 5 4
+x4x 5 45 x
=5×
-5x 5
×5 4 2 5
+x•5x 3 5x x
=
-5x
+35x 2 5x
=7 2
,5x
将x=10代入得:原式=
×7 2
=5×10 35 2
.2
先化简,再求值5
|
5
-x 5 5 4
+x4x 5 45 x
=5×
-5x 5
×5 4 2 5
+x•5x 3 5x x
=
-5x
+35x 2 5x
=7 2
,5x
将x=10代入得:原式=
×7 2
=5×10 35 2
.2