问题 解答题
用合理的方法计算.
1
16
÷[
1
25
×(
2
5
+
1
10
)]

5.6×3
3
4
-4
2
5
×3.75+0.88×37
1
2

(947
3
5
+94
19
25
+9.476+0.9476)÷0.1111
2011×(3.4×69+3.5)
3.5×69-3.4
答案

(1)

1
16
÷[
1
25
×(
2
5
+
1
10
)],

=

1
16
÷[
1
25
×(
4
10
+
1
10
)],

=

1
16
÷[
1
25
×
1
2
],

=

1
16
÷
1
50

=

1
16
×50,

=

25
8

(2)5.6×3

3
4
-4
2
5
×3.75+0.88×37
1
2

=5.6×3.75-4.4×3.75+0.88×37.5,

=5.6×3.75-4.4×3.75+8.8×3.75,

=(5.6-4.4+8.8)×3.75,

=10×3.75,

=37.5;

(3)(947

3
5
+94
19
25
+9.476+0.9476)÷0.1111,

=(947.6+94.76+9.476+0.9476)÷0.1111,

=(9476×0.1+9476×0.01+9476×0.001+9476×0.0001)÷0.1111,

=[(0.1+0.01+0.001+0.0001)×9476]÷0.1111,

=0.1111×9476÷0.1111,

=9476;

(4)

2011×(3.4×69+3.5)
3.5×69-3.4

=

2011×[3.4×(70-1)+3.5]
[(3.4+0.1)×69-3.4]

=

2011×(3.4×70+0.1)
3.4×69+3.5

=

2011×(3.4×70+0.1)
3.4×70+0.1

=2011.

单项选择题
单项选择题