问题 解答题
简便计算:
(1)24.87-0.53-1.47
(2)50×(
3
10
+
2
5
-
6
25
)

(3)0.375×
15
2
+
3
8
-
1
2
÷
8
3
答案

(1)24.87-0.53-1.47,

=24.87-(0.53+1.47),

=24.87-2,

=22.87;

(2)50×(

3
10
+
2
5
-
6
25
),

=50×

3
10
+
2
5
×50-50×
6
25

=15+20-12,

=35-12,

=23;

(3)0.375×

15
2
+
3
8
-
1
2
÷
8
3

=

3
8
×
15
2
+
3
8
-
1
2
×
3
8

=(

15
2
+1-
1
2
)×
3
8

=8×

3
8

=3.

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