问题
解答题
|
答案
(1)1-(
-7 9
),5 9
=1-
,2 9
=
;7 9
(2)(87-62)×280,
=25×280,
=25×4×70,
=100×70,
=7000;
(3)7.87+(5-3.245),
=7.87+1.755,
=9.625.
|
(1)1-(
-7 9
),5 9
=1-
,2 9
=
;7 9
(2)(87-62)×280,
=25×280,
=25×4×70,
=100×70,
=7000;
(3)7.87+(5-3.245),
=7.87+1.755,
=9.625.