问题 解答题
1
4
+
1
5
=
1-
6
11
=
6
7
=
1
2
-
1
3
=
1
5
×
1
5
=
19
10
=
0.9+99×0.9=
5
6
+
1
4
)×12=
3
4
:X=3:12
答案

1
4
+
1
5
=
9
20
1-
6
11
=
5
11
6
7
=
7
6
1
2
-
1
3
=
1
6
1
5
×
1
5
=
1
25
19
10
=0;
0.9+99×0.9,

=0.9×(99+1),

=0.9×100,

=90;

5
6
+
1
4
)×12,

=

5
6
×12+
1
4
×12,

=10+3,

=13;

3
4
:X=3:12,

3x=

3
4
×12,

3x=9,

3x÷3=9÷3,

x=3.

故答案为:

9
20
5
11
7
6
1
6
1
25
,0,90,13,x=3.

单项选择题
单项选择题