问题 解答题
选择合理的方法计算.
①5400-2940÷28×27
②(
1
4
-
1
10
÷2)÷
3
10

③9×(
4
9
+
1
14
)+
5
14

④(
1
15
+
2
17
)×15×17.
答案

①5400-2940÷28×27,

=5400-105×27,

=5400-2835,

=2565;

②(

1
4
-
1
10
÷2)÷
3
10

=(

1
4
-
1
20
)÷
3
10

=

1
5
×
10
3

=

2
3

③9×(

4
9
+
1
14
)+
5
14

=9×

4
9
+9×
1
14
+
5
14

=4+

9
14
+
5
14

=4+(

9
14
+
5
14
),

=4+1,

=5;

④(

1
15
+
2
17
)×15×17,

=(

1
15
+
2
17
)×(15×17),

=

1
15
×(15×17)+
2
17
×(15×17),

=(

1
15
×15)×17+(
2
17
×17)×15,

=1×17+2×15,

=17+30,

=47.

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