题目内容

计算下面各题,能简算的要简算.
8
9
÷[(
2
5
+
1
10
)
×
3
4
]

(1-
3
5
)÷0.25×4
7.5×2.8-7.5×1.812÷(
7
12
-
4
7
+
5
12
(1)
8
9
÷[(
2
5
+
1
10
)×
3
4
]
=
8
9
÷[
1
2
×
3
4
],
=
8
9
×
8
3

=
64
27


(2)(1-
3
5
)÷0.25×4
=
2
5
×4×4,
=
32
5


(3)7.5×2.8-7.5×1.8
=(2.8-1.8)×7.5,
=1×7.5,
=7.5;

(4)12÷(
7
12
-
4
7
+
5
12

=12÷(
7
12
+
5
12
-
4
7
),
=12÷(1-
4
7
),
=12×
7
3

=28.
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