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脱式计算. 99×87+87 18.7-3.375-6.625 525×(34+0.5)÷214 415÷[(57-314)÷34].

编辑:chaxungu时间:2026-04-27 13:18:22分类:小学数学题库

脱式计算.
99×87+8718.7-3.375-6.625
5
2
5
×(
3
4
+0.5)÷2
1
4
4
15
÷[(
5
7
-
3
14
)÷
3
4
].
(1)99×87+87,
=(99+1)×87,
=100×87,
=8700;

(2)18.7-3.375-6.625,
=18.7-(3.375+6.625),
=18.7-10,
=8.7;

(3)5
2
5
×(
3
4
+0.5)÷2
1
4
,
=5
2
5
×
5
4
÷2
1
4
,
=6
3
4
÷2
1
4
,
=3;

(4)
4
15
÷[(
5
7
-
3
14
)÷
3
4
],
=
4
15
÷[
1
2
÷
3
4
],
=
4
15
÷
2
3
,
=
2
5
.