问题 解答题
计算下列各题,能简算的要用简便方法计算:
9.4×
1
4
+0.25×
3
5

1
6
÷[1÷(
3
5
-
3
10
)]
7
10
+
5
6
-
4
5
)×30×2
3
14
×(
3
4
-
1
10
÷2)
答案

(1)9.4×

1
4
+0.25×
3
5

=9.4×0.25+0.25×0.6,

=(9.4+0.6)×0.25,

=10×0.25,

=2.5;

(2)

1
6
÷[1÷(
3
5
-
3
10
)],

=

1
6
÷[1÷
3
10
],

=

1
6
÷
10
3

=

1
20

(3)(

7
10
+
5
6
-
4
5
)×30×2,

=(

7
10
+
5
6
-
4
5
)×(30×2),

=(

7
10
+
5
6
-
4
5
)×60,

=

7
10
×60+
5
6
×60-
4
5
×60,

=42+50-48,

=92-48,

=44;

(4)

3
14
×(
3
4
-
1
10
÷2),

=

3
14
×(
3
4
-
1
20
),

=

3
14
×
14
20

=

3
20

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