问题
解答题
|
答案
(1)12-
+2 7
÷1 7
,1 5
=12-
+2 7
×5,1 7
=12+(
-5 7
),2 7
=12+
,3 7
=12
;3 7
(2)76×
,76 77
=(77-1)×
,76 77
=77×
-76 77
,76 77
=76-
,76 77
=75
;1 77
(3)(
+2 5
)×5×7,6 7
=
×5×7+2 5
×5×7,6 7
=14+30,
=44;
(4)
÷7+5 12
×7 12
,1 7
=
×5 12
+1 7
×7 12
,1 7
=(
+5 12
)×7 12
,1 7
=1×
,1 7
=
.1 7