问题 解答题
计算下面各题,能简便计算的要简便计算.
10.15-6.25-3.75
1.75-(0.75+
2
5
11
8
+
11
8
×3
3
5
+
2
5
÷
3
5
+
2
5
1
1
8
÷(2.5×
4
5
6.48÷[(3.3-2.7)×0.9].
答案

(1)10.15-6.25-3.75,

=10.15-(6.25+3.75),

=10.15-10,

=0.15;

(2)1.75-(0.75+

2
5
),

=1.75-0.75-0.4,

=1-0.4,

=0.6;

(3)9×

11
8
+
11
8
×
3,

=(9+3)×

11
8

=12×

11
8

=

33
2

(4)

3
5
+
2
5
÷
3
5
+
2
5

=(

3
5
+
2
5
)+
2
5
×
5
3

=1+

2
3

=1

2
3

(5)1

1
8
÷(2.5×
4
5
),

=

9
8
÷(
5
2
×
4
5
),

=

9
8
÷2,

=

9
8
×
1
2

=

9
16

(6)6.48÷[(3.3-2.7)×0.9],

=6.48÷[0.6×0.9],

=6.48÷0.6÷0.9,

=10.8÷0.9,

=12.

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