题目内容

递等式计算(能简便就要简便)
7
8
+
5
12
-
1
6
②1
11
26
-
11
13
-
2
13
+
2
26
32
27
-(
5
27
+
7
16
④10-
2
9
-
3
9
5
9
-(
5
6
-
7
12
3
5
+1
2
7
+0.4-
2
7
7
8
+
5
12
-
1
6

=24×(
7
8
+
5
12
-
1
6
)÷24,
=(24×
7
8
+24×
5
12
-24×
1
6
)÷24,
=(21+10-4)÷24,
=27÷24,
=
9
8

=1
1
8


②1
11
26
-
11
13
-
2
13
+
2
26

=(1
11
26
+
2
26
)-(
11
13
+
2
13
),
=1.5-1,
=0.5;

32
27
-(
5
27
+
7
16
),
=
32
27
-
5
27
-
7
16

=1-
7
16

=
9
16


④10-
2
9
-
3
9

=10-(
2
9
+
3
9
),
=10-
5
9

=9
4
9


5
9
-(
5
6
-
7
12
),
=36×[
5
9
-(
5
6
-
7
12
)]÷36,
=[36×
5
9
-36×(
5
6
-
7
12
)]÷36,
=[20-(30-21)]÷36,
=[20-9]÷36,
=11÷36,
=
11
36


3
5
+1
2
7
+0.4-
2
7

=(
3
5
+0.4)+(1
2
7
-
2
7
),
=1+1,
=2.
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