问题 解答题
简便计算.
8×7.3+8×2.7
3
5
6
-
2
5
-
3
5

5
6
+
8
17
+
1
6
+
9
17

2
5
+
5
7
-
2
5
+
5
7
答案

(1)8×7.3+8×2.7,

=8×(7.3+2.7),

=8×10,

=80;

(2)3

5
6
-
2
5
-
3
5

=3

5
6
-(
2
5
+
3
5
),

=3

5
6
-1,

=2

5
6

(3)

5
6
+
8
17
+
1
6
+
9
17

=(

5
6
+
1
6
)+(
8
17
+
9
17
),

=1+1,

=2;

(4)

2
5
+
5
7
-
2
5
+
5
7

=(

2
5
-
2
5
)+(
5
7
+
5
7
),

=0+

10
7

=1

3
7

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