题目内容

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

③
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
.
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