问题
解答题
直接写出答案 (1)8+98+998 (2)2
(3)12.5×5×0.16= (4)
|
答案
(1)8+98+998,
=2+2+4+98+998,
=(2+98)+(2+998)+4,
=100+1000+4,
=1104;
(2)2
-(3 2008
+11 5
),3 2008
=2
-3 2008
-11 5
,3 2008
=2
-13 2008
-3 2008
,1 5
=1-
,1 5
=
;4 5
(3)12.5×5×0.16,
=12.5×5×(0.4×0.4),
=12.5×5×0.4×0.4,
=(12.5×0.4)×(5×0.4),
=5×2,
=10;
(4)
÷7,7 8
=
×7 8
,1 7
=
.1 8