问题 解答题
用简便方法计算下面各题.
4
5
÷
2
15
-
1
5
÷
2
15
3
4
+
2
3
+
1
6
)÷
1
12
99%×99+99%4×8×1.25×25%
答案

解;①

4
5
÷
2
15
-
1
5
÷
2
15

=

4
5
×
15
2
-
1
5
×
15
2

=

15
2
×(
4
5
-
1
5
),

=

15
2
×
3
5

=

9
2

②(

3
4
+
2
3
+
1
6
)÷
1
12

=(

3
4
+
2
3
+
1
6
)×12,

=

3
4
×12+
2
3
×12+
1
6
×12,

=9+8+2,

=19;

③99%×99+99%,

=0.99×99+0.99,

=0.99×(99+1),

=0.99×100,

=99;

④4×8×1.25×25%,

=4×8×1.25×0.25,

=(4×0.25)×(8×1.25),

=1×10,

=10.

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