问题 解答题
用你喜欢的方法计算.
18×(
2
3
+
4
9
-
5
6

1
5
÷
3
4
+
4
5
×
2
3

(7.1-1.7)÷0.9+36.
答案

18×(

2
3
+
4
9
-
5
6
),

=18×

2
3
+18×
4
9
-18×
5
6

=12+8-15,

=5;

(2)

1
5
÷
3
4
+
4
5
×
2
3

=

1
5
×
4
3
+
4
5
×
2
3

=

4
5
×
1
3
+
4
5
×
2
3

=

4
5
×(
1
3
+
2
3
),

=

4
5
×1,

=

4
5

(3)(7.1-1.7)÷0.9+36,

=5.4÷0.9+36,

=6+36,

=42.

单项选择题
单项选择题