问题 解答题
简算
①9
2
5
-(3
3
7
+0.4)
②1.8×
1
4
+2.2×25%
8
9
×[0.75-(
7
16
-
1
4
)].
答案

①9

2
5
-(3
3
7
+0.4),

=9

2
5
-3
3
7
-0.4,

=9

2
5
-
2
5
-3
3
7

=9-3

3
7

=5

4
7

②1.8×

1
4
+2.2×25%,

=(1.8+2.2)×

1
4

=4×

1
4

=1;

8
9
×[0.75-(
7
16
-
1
4
)],

=

8
9
×[0.75-
7
16
+
1
4
],

=

8
9
×[
3
4
+
1
4
-
7
16
],

=

8
9
×(1-
7
16
),

=

8
9
×
9
16

=

1
2

多项选择题
单项选择题