问题
解答题
简便计算:(1)9
(2)-|-
|
答案
(1)原式=(10-
)×17,1 17
=10×17-
×17,1 17
=169;
(2)原式=-
×11 5
+1 4
×11 5
,21 4
=
×(-11 5
+1 4
),21 4
=11.
简便计算:(1)9
(2)-|-
|
(1)原式=(10-
)×17,1 17
=10×17-
×17,1 17
=169;
(2)原式=-
×11 5
+1 4
×11 5
,21 4
=
×(-11 5
+1 4
),21 4
=11.