题目内容

脱式计算.(能简算的要简算)
(1)975×0.25+9
3
4
×76-9.75

(2)
84
5
÷[7.8+
5
8
×(
23
4
-1.15)]

(3)[2-(3.75×.1
1
3
-2
2
5
÷0.6)]÷0.2

(4)1+2
1
6
+3
1
12?
+4
1
20
+5
1
30
+6
1
42
+7
1
56
+8
1
72
(1)975×0.25+9
3
4
×76-9.75

=9.75×25+9.75×76-9.75,
=9.75×(25+76-1),
=9.75×100,
=975;
(2)
84
5
÷[7.8+
5
8
×(
23
4
-1.15)]

=
84
5
÷[7.8+
5
8
×4.6],
=
84
5
÷[7.8+2.875],
=
84
5
÷10.675,
=
672
427

(3)[2-(3.75×.1
1
3
-2
2
5
÷0.6)]÷0.2

=[2-(5-4)]÷0.2,
=[2-1]÷0.2,
=1÷0.2,
=5;
(4)1+2
1
6
+3
1
12?
+4
1
20
+5
1
30
+6
1
42
+7
1
56
+8
1
72

=(1+2+3+4+5+6+7+8)+(
1
6
+
1
12
+
1
20
+
1
30
+
1
42
+
1
56
+
1
72
),
=36+(
1
2
-
1
3
+
1
3
-
1
4
+
1
4
-
1
5
+
1
5
-
1
6
+
1
6
-
1
7
+
1
7
-
1
8
+
1
8
-
1
9
),
=36+(
1
2
-
1
9
),
=36+
7
18

=36
7
18
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