问题
解答题
先化简,再求值:
|
答案
-4 m-3
=2m-6 m2-6m+9
-4 m-3 2(m-3) (m-3)2
=
-4 m-3 2 m-3
=
;2 m-3
当m=7时,原式=
=2 7-3
.1 2
先化简,再求值:
|
-4 m-3
=2m-6 m2-6m+9
-4 m-3 2(m-3) (m-3)2
=
-4 m-3 2 m-3
=
;2 m-3
当m=7时,原式=
=2 7-3
.1 2