问题
解答题
化简与求值 (1)2
(2)3
(3)计算:
|
答案
(1)原式=6
-42
+2 2 4
=
;9 2 4
(2)原式=6
(32
-56
-22
)6
=6
(2
-56
)2
=12
-60;3
(3)原式=2x
-xx
+3xx x
=4x
,x
当x=5时,原式=4×5×
=205
.5
化简与求值 (1)2
(2)3
(3)计算:
|
(1)原式=6
-42
+2 2 4
=
;9 2 4
(2)原式=6
(32
-56
-22
)6
=6
(2
-56
)2
=12
-60;3
(3)原式=2x
-xx
+3xx x
=4x
,x
当x=5时,原式=4×5×
=205
.5