问题
解答题
|
答案
①3.6×(1-20%),
=3.6×0.8,
=2.88;
②3-
-7 12
,5 12
=3-(
+7 12
),5 12
=3-1,
=2;
③
×5 7
+3 8
×5 8
,5 7
=
×(5 7
+3 8
),5 8
=
×1,5 7
=
;5 7
④(
+1 4
-5 6
)×12,1 3
=
×12+1 4
×12-5 6
×12,1 3
=3+10-4,
=9.