问题 解答题
用递等式计算.
(1)1292+540÷18×24(2)1.05×(3.8-0.8)÷6.3
(3)
9
20
÷[
1
2
×(
2
5
+
4
5
)]
(4)[1-(
1
4
+
3
8
)]÷
15
16
答案

(1)1292+540÷18×24,

=1292+30×24,

=1292+720,

=2012;

(2)1.05×(3.8-0.8)÷6.3,

=1.05×3÷6.3,

=3.15÷6.3,

=0.5;

(3)

9
20
÷[
1
2
×(
2
5
+
4
5
)],

=

9
20
÷[
1
2
×
6
5
],

=

9
20
÷
3
5

=

3
4

(4)[1-(

1
4
+
3
8
)]÷
15
16

=[1-

5
8
15
16

=

3
8
÷
15
16

=

2
5

判断题
判断题