问题 解答题
脱式计算
①4
3
4
-9
7
11
+(8
1
4
-2
4
11
②(9.1×7.5×4.6)÷(1.3×2.5×2.3)
7
15
×
3
8
+
1
15
×
7
16
+
1
15
×3
1
2
1
2
+
1
6
+
1
12
+
1
20
+
1
30
+
1
42
答案

①4

3
4
-9
7
11
+(8
1
4
-2
4
11
),

=(4

3
4
+8
1
4
)-(9
7
11
+2
4
11
),

=13-12,

=1;

②(9.1×7.5×4.6)÷(1.3×2.5×2.3),

=

9.1×7.5×4.6
1.3×2.5×2.3

=7×3×2,

=42;

7
15
×
3
8
+
1
15
×
7
16
+
1
15
×3
1
2

=

7
15
×
3
8
+
7
15
×
1
16
+
7
15
×
1
2

=

7
15
×(
3
8
+
1
16
+
1
2
),

=

7
15
×
15
16

=

7
16

1
2
+
1
6
+
1
12
+
1
20
+
1
30
+
1
42

=

1
2
+
1
2
-
1
3
+
1
3
-
1
4
+
1
4
-
1
5
+
1
5
-
1
6
+
1
6
-
1
7

=

1
2
+
1
2
-
1
7

=1-

1
7

=

6
7

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