问题
解答题
(
1÷(
|
答案
(1)
÷21×7 9
,3 4
=
×1 27
,3 4
=
;1 36
(2)(
+13 14
)÷5 7
,13 14
=
×13 14
+14 13
×5 7
,14 13
=1+
,10 13
=1
;10 13
(3)1÷(
+2.1×2 5
),2 3
=1÷(
+1.4),2 5
=1÷1.8,
=
.5 9
(
1÷(
|
(1)
÷21×7 9
,3 4
=
×1 27
,3 4
=
;1 36
(2)(
+13 14
)÷5 7
,13 14
=
×13 14
+14 13
×5 7
,14 13
=1+
,10 13
=1
;10 13
(3)1÷(
+2.1×2 5
),2 3
=1÷(
+1.4),2 5
=1÷1.8,
=
.5 9