问题 解答题
怎样算简便就怎样算
14
15
-(
6
15
+
1
3
13
5
-0.81-0.19
7
8
+
1
8
-
5
9
-
4
9
④5-(0.5-
3
10
⑤7.68-7.68×0.5⑥5.2+4.8×3.5.
答案

14
15
-(
6
15
+
1
3
),

=

14
15
-
6
15
-
1
3

=

8
15
-
5
15

=

1
5

13
5
-0.81-0.19,

=

13
5
-(0.81+0.19),

=

13
5
-1,

=

8
5

7
8
+
1
8
-
5
9
-
4
9

=(

7
8
+
1
8
)-(
5
9
+
4
9
),

=1-1,

=0;

④5-(0.5-

3
10
),

=5-0.2,

=4.8;

⑤7.68-7.68×0.5,

=7.68×(1-0.5),

=7.68×0.5,

=3.84;

⑥5.2+4.8×3.5,

=5.2+16.8,

=22.

单项选择题
单项选择题