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能简便的要简便. ①(78-516)×(59+23) ②813÷7+17×613 ③234×25+14÷52 ④16÷[917×(34+23)] ⑤1213×37+47×1213+1213 ⑥99×9

编辑:chaxungu时间:2026-04-27 13:18:59分类:小学数学题库

能简便的要简便.
①(
7
8
-
5
16
)×(
5
9
+
2
3
)
②
8
13
÷7+
1
7
×
6
13
③2
3
4
×
2
5
+
1
4
÷
5
2
④
1
6
÷[
9
17
×(
3
4
+
2
3
)]
⑤
12
13
×
3
7
+
4
7
×
12
13
+
12
13
⑥99×
99
100
⑦100×
98
99
.

①(
7
8
-
5
16
)×(
5
9
+
2
3
),
=
1
2
×
11
9
,
=
11
18
;

②
8
13
÷7+
1
7
×
6
13
,
=
8
13
×
1
7
+
1
7
×
6
13
,
=(
8
13
+
6
13
)×
1
7
,
=
14
13
×
1
7
,
=
2
13
;

③2
3
4
×
2
5
+
1
4
÷
5
2
,
=2
3
4
×
2
5
+
1
4
×
2
5
,
=(2
3
4
+
1
4
)×
2
5
,
=3×
2
5
,
=
6
5
;

④
1
6
÷[
9
17
×(
3
4
+
2
3
)],
=
1
6
÷[
9
17
×
17
12
],
=
1
6
÷
3
4
,
=
2
9
;

⑤
12
13
×
3
7
+
4
7
×
12
13
+
12
13
,
=
12
13
×(
3
7
+
4
7
+1),
=
12
13
×2,
=
24
13
;

⑥99×
99
100
,
=(100-1)×
99
100
,
=100×
99
100
-1×
99
100
,
=99-
99
100
,
=98
1
100
;

⑦100×
98
99
,
=(99+1)×
98
99
,
=99×
98
99
+1×
98
99
,
=98+
98
99
,
=98
98
99
.