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下列各题,能用简便的要用简便方法计算.①17.25+3.05+2.75+3.95②24×(34+56-12)③1316×(913×17-913)④(78-516)×(59+23)

题目详情
下列各题,能用简便的要用简便方法计算.
①17.25+3.05+2.75+3.95 ②24×(
3
4
+
5
6
-
1
2
13
16
×(
9
13
×17-
9
13
④(
7
8
-
5
16
)×(
5
9
+
2
3
①17.25+3.05+2.75+3.95 ②24×(
3
4
+
5
6
-
1
2
13
16
×(
9
13
×17-
9
13
④(
7
8
-
5
16
)×(
5
9
+
2
3
①17.25+3.05+2.75+3.95 ②24×(
3
4
+
5
6
-
1
2
①17.25+3.05+2.75+3.95②24×(
3
4
+
5
6
-
1
2
3
4
+
5
6
-
1
2
3
4
3344
5
6
-
1
2
5
6
5566
1
2
1
2
1122 ③
13
16
×(
9
13
×17-
9
13
④(
7
8
-
5
16
)×(
5
9
+
2
3
13
16
×(
9
13
×17-
9
13
13
16
×(
9
13
×17-
9
13
13
16
13131616
9
13
×17-
9
13
9
13
991313
9
13
9
13
991313④(
7
8
-
5
16
)×(
5
9
+
2
3
7
8
-
5
16
)×(
5
9
+
2
3
7
8
7788
5
16
)×(
5
9
+
2
3
5
16
551616
5
9
+
2
3
5
9
5599
2
3
2
3
2233
▼优质解答
答案和解析
①17.25+3.05+2.75+3.95,
=(17.25+2.75)+(3.05+3.95),
=20+7,
=27;

②24×(
3
4
+
5
6
-
1
2
),
=24×
3
4
+24×
5
6
-24×
1
2

=18+20-12,
=26;

13
16
×(
9
13
×17-
9
13
),
=
13
16
×
9
13
×17-
13
16
×
9
13

=
9
16
×17-
9
16

=
9
16
×16,
=9;

④(
7
8
-
5
16
)×(
5
9
+
2
3
),
=
9
16
×
11
9

=
11
16
3
4
333444+
5
6
-
1
2
),
=24×
3
4
+24×
5
6
-24×
1
2

=18+20-12,
=26;

13
16
×(
9
13
×17-
9
13
),
=
13
16
×
9
13
×17-
13
16
×
9
13

=
9
16
×17-
9
16

=
9
16
×16,
=9;

④(
7
8
-
5
16
)×(
5
9
+
2
3
),
=
9
16
×
11
9

=
11
16
5
6
555666-
1
2
),
=24×
3
4
+24×
5
6
-24×
1
2

=18+20-12,
=26;

13
16
×(
9
13
×17-
9
13
),
=
13
16
×
9
13
×17-
13
16
×
9
13

=
9
16
×17-
9
16

=
9
16
×16,
=9;

④(
7
8
-
5
16
)×(
5
9
+
2
3
),
=
9
16
×
11
9

=
11
16
1
2
111222),
=24×
3
4
+24×
5
6
-24×
1
2

=18+20-12,
=26;

13
16
×(
9
13
×17-
9
13
),
=
13
16
×
9
13
×17-
13
16
×
9
13

=
9
16
×17-
9
16

=
9
16
×16,
=9;

④(
7
8
-
5
16
)×(
5
9
+
2
3
),
=
9
16
×
11
9

=
11
16
3
4
333444+24×
5
6
-24×
1
2

=18+20-12,
=26;

13
16
×(
9
13
×17-
9
13
),
=
13
16
×
9
13
×17-
13
16
×
9
13

=
9
16
×17-
9
16

=
9
16
×16,
=9;

④(
7
8
-
5
16
)×(
5
9
+
2
3
),
=
9
16
×
11
9

=
11
16
5
6
555666-24×
1
2

=18+20-12,
=26;

13
16
×(
9
13
×17-
9
13
),
=
13
16
×
9
13
×17-
13
16
×
9
13

=
9
16
×17-
9
16

=
9
16
×16,
=9;

④(
7
8
-
5
16
)×(
5
9
+
2
3
),
=
9
16
×
11
9

=
11
16
1
2
111222,
=18+20-12,
=26;

13
16
×(
9
13
×17-
9
13
),
=
13
16
×
9
13
×17-
13
16
×
9
13

=
9
16
×17-
9
16

=
9
16
×16,
=9;

④(
7
8
-
5
16
)×(
5
9
+
2
3
),
=
9
16
×
11
9

=
11
16
13
16
131313161616×(
9
13
×17-
9
13
),
=
13
16
×
9
13
×17-
13
16
×
9
13

=
9
16
×17-
9
16

=
9
16
×16,
=9;

④(
7
8
-
5
16
)×(
5
9
+
2
3
),
=
9
16
×
11
9

=
11
16
9
13
999131313×17-
9
13
),
=
13
16
×
9
13
×17-
13
16
×
9
13

=
9
16
×17-
9
16

=
9
16
×16,
=9;

④(
7
8
-
5
16
)×(
5
9
+
2
3
),
=
9
16
×
11
9

=
11
16
9
13
999131313),
=
13
16
×
9
13
×17-
13
16
×
9
13

=
9
16
×17-
9
16

=
9
16
×16,
=9;

④(
7
8
-
5
16
)×(
5
9
+
2
3
),
=
9
16
×
11
9

=
11
16
13
16
131313161616×
9
13
×17-
13
16
×
9
13

=
9
16
×17-
9
16

=
9
16
×16,
=9;

④(
7
8
-
5
16
)×(
5
9
+
2
3
),
=
9
16
×
11
9

=
11
16
9
13
999131313×17-
13
16
×
9
13

=
9
16
×17-
9
16

=
9
16
×16,
=9;

④(
7
8
-
5
16
)×(
5
9
+
2
3
),
=
9
16
×
11
9

=
11
16
13
16
131313161616×
9
13

=
9
16
×17-
9
16

=
9
16
×16,
=9;

④(
7
8
-
5
16
)×(
5
9
+
2
3
),
=
9
16
×
11
9

=
11
16
9
13
999131313,
=
9
16
×17-
9
16

=
9
16
×16,
=9;

④(
7
8
-
5
16
)×(
5
9
+
2
3
),
=
9
16
×
11
9

=
11
16
9
16
999161616×17-
9
16

=
9
16
×16,
=9;

④(
7
8
-
5
16
)×(
5
9
+
2
3
),
=
9
16
×
11
9

=
11
16
9
16
999161616,
=
9
16
×16,
=9;

④(
7
8
-
5
16
)×(
5
9
+
2
3
),
=
9
16
×
11
9

=
11
16
9
16
999161616×16,
=9;

④(
7
8
-
5
16
)×(
5
9
+
2
3
),
=
9
16
×
11
9

=
11
16
7
8
777888-
5
16
)×(
5
9
+
2
3
),
=
9
16
×
11
9

=
11
16
5
16
555161616)×(
5
9
+
2
3
),
=
9
16
×
11
9

=
11
16
5
9
555999+
2
3
),
=
9
16
×
11
9

=
11
16
2
3
222333),
=
9
16
×
11
9

=
11
16
9
16
999161616×
11
9

=
11
16
11
9
111111999,
=
11
16
11
16
111111161616.