题目内容

下面各题,怎样简便就就怎样算.
(1)0.65×
1
4
+0.35×25%
(2)(
4
5
+
1
4
)÷
7
3
+
7
10

(3)
1.7×2.5×0.4
0.25×1.6×34

(4)(111+999)÷[56×(
3
7
-
3
8
)]
(1)0.65×
1
4
+0.35×25%,
=(0.65+0.35)×
1
4

=1×
1
4

=
1
4


(2)(
4
5
+
1
4
)÷
7
3
+
7
10

=
21
20
÷
7
3
+
7
10

=
9
20
+
7
10

=1
3
20


(3)
1.7×2.5×0.4
0.25×1.6×34

=
1×10×1
1×4×20

=
1
8


(4)(111+999)÷[56×(
3
7
-
3
8
)]

=1110÷[56×
3
7
-56×
3
8
],
=1110÷3,
=370.
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