题目内容

脱式计算.(能简便的要简便)
60×(
7
5
-
2
3
7
9
÷
11
5
+
2
9
×
5
11
8×40%+
2
5
÷
1
2
1
6
+
3
4
×
2
3
÷2
6.23×[1÷(
21
10
-2.09)]
7
8
+
13
16
)÷
13
16
86×
23
87
8
5
-
7
15
-
6
15
-
2
15
(1)60×(
7
5
-
2
3

=60×
7
5
-
2
3
×60
=84-40
=44;

(2)
7
9
÷
11
5
+
2
9
×
5
11

=
7
9
×
5
11
+
2
9
×
5
11

=(
7
9
+
2
9
)×
5
11

=1×
5
11

=
5
11


(3)8×40%+
2
5
÷
1
2

=8×
2
5
+
2
5
×2
=(8+2)×
2
5

=10×
2
5

=4;

(4)
1
6
+
3
4
×
2
3
÷2
=
1
6
+
3
4
×
2
3
×
1
2

=
1
6
+
1
4

=
5
12


(5)6.23×[1÷(
21
10
-2.09)]
=6.23×[1÷(
21
10
-
209
100
)]
=6.23×[1÷
1
100
]
=6.23×100
=623;

(6)(
7
8
+
13
16
)÷
13
16

=
27
16
×
16
13

=
27
13


(7)86×
23
87

=(87-1)×
23
87

=87×
23
87
-
23
87

=23-
23
87

=22
64
87


(8)
8
5
-
7
15
-
6
15
-
2
15

=
8
5
-(
7
15
+
6
15
+
2
15

=
8
5
-1
=
3
5
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