问题 解答题
用简便方法计算.
(1)1.25×32×0.25(2)5.2+
5
8
+3.8+
3
8
(3)
8
13
÷7+
5
13
×
1
7
(4)7.25-84%-0.16.
答案

(1)1.25×32×0.25,

=1.25×8×4×0.25,

=(1.25×8)×(4×0.25),

=10×1,

=10;

(2)5.2+

5
8
+3.8+
3
8

=(5.2+3.8)+(

5
8
+
3
8
),

=9+1,

=10;

(3)

8
13
÷7+
5
13
×
1
7

=

8
13
×
1
7
+
5
13
×
1
7

=(

8
13
+
5
13
)×
1
7

=1×

1
7

=

1
7

(4)7.25-84%-0.16,

=7.25-0.84-0.16,

=7.25-(0.84+0.16),

=7.25-1,

=6.25.

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