题目内容

脱式计算,能进行简便运算的要简便.
(1)6.7×40.3÷1.25÷(67×0.8)
(2)3
4
15
×(
5
7
-
3
14
÷
3
4

(3)5
3
5
×2
1
7
-1.2×1
1
3
+12
1
2

(4)2.4×[3
4
5
÷(3+2.4×1
4
15
)]
(5)
2
2×4
+
2
4×6
+
2
6×8
+
2
8×10
+
2
10×12
(1)6.7×40.3÷1.25÷(67×0.8),
=6.7×40.3÷1.25÷67÷0.8,
=(6.7÷67)×40.3÷(1.25×0.8),
=0.1×40.3÷1,
=4.03;

(2)3
4
15
×(
5
7
-
3
14
÷
3
4
),
=3
4
15
×(
5
7
-
2
7
),
=
49
15
×
3
7

=
7
5


(3)5
3
5
×2
1
7
-1.2×1
1
3
+12
1
2

=
28
5
×
15
7
-
6
5
×
4
3
+12
1
2

=12-1.6+12.5,
=22.9;

(4)2.4×[3
4
5
÷(3+2.4×1
4
15
)],
=2.4×[3
4
5
÷(3+
12
5
×
19
15
)],
=2.4×[3
4
5
÷(3+
76
25
)],
=2.4×[3
4
5
÷
151
25
],
=2.4×[
19
5
×
25
151
],
=
12
5
×
95
151

=
228
151


(5)
2
2×4
+
2
4×6
+
2
6×8
+
2
8×10
+
2
10×12

=
1
2
-
1
4
+
1
4
-
1
6
+
1
6
-
1
8
+
1
8
-
1
10
+
1
10
-
1
12

=
1
2
-
1
12

=
5
12
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