问题 解答题
能简算的要简算
2
3
-
1
2
)×
3
5
÷
9
10
11
12
×
1
6
+
5
6
×
11
12
40%×
9
20
+0.45×70%-45%×0.1.
答案

(1)(

2
3
-
1
2
)×
3
5
÷
9
10

=(

4
6
-
3
6
)×
3
5
×
10
9

=

1
6
×
3
5
×
10
9

=

1
9

(2)

11
12
×
1
6
+
5
6
×
11
12

=

11
12
×(
1
6
+
5
6
),

=

11
12
×1,

=

11
12

(3)40%×

9
20
+0.45×70%-45%×0.1,

=40%×0.45+0.45×70%-0.45×0.1,

=0.45×(40%+70%-0.1),

=0.45×(1.1-0.1),

=0.45.

判断题
单项选择题