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脱式计算.能简算的要简算. 49×0.875×92 34÷[(13+12)×12] 613×27+813×27 4-915÷95-23.

编辑:chaxungu时间:2026-04-27 13:18:52分类:小学数学题库

脱式计算,能简算的要简算.
4
9
×0.875×
9
2
3
4
÷[(
1
3
+
1
2
)×12]
6
13
×
2
7
+
8
13
×
2
7
4-
9
15
÷
9
5
-
2
3
.

(1)
4
9
×0.875×
9
2
,
=
4
9
×
9
2
×0.875,
=2×0.875,
=1.75;

(2)
3
4
÷[(
1
3
+
1
2
)×12],
=
3
4
÷[
1
3
×12+
1
2
×12],
=
3
4
÷[4+6],
=
3
4
÷10,
=
3
40
;

(3)
6
13
×
2
7
+
8
13
×
2
7
,
=(
6
13
+
8
13
)×
2
7
,
=
14
13
×
2
7
,
=
4
13
;

(4)4-
9
15
÷
9
5
-
2
3
,
=4-
1
3
-
2
3
,
=4-(
1
3
+
2
3
),
=4-1,
=3.