题目内容

怎样简便就怎样计算.
(1)3618÷45-0.2
(2)4-
4
5
÷4-
4
5

(3)
13
5
×8×
8
13
×1.25
(4)2.9÷8+1.1×
1
8
(1)3618÷45-0.2,
=80.4-0.2,
=80.2;

(2)4-
4
5
÷4-
4
5

=4-
4
5
×
1
4
-
4
5

=4-
1
5
-
4
5

=4-(
1
5
+
4
5
),
=3;

(3)
13
5
×8×
8
13
×1.25,
=
13
5
×
8
13
×8×1.25,
=(
13
5
×
8
13
)×(8×1.25),
=
8
5
×10,
=16;

(4)2.9÷8+1.1×
1
8

=2.9×
1
8
+1.1×
1
8

=(2.9+1.1)×
1
8

=4×
1
8

=
1
2
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