题目内容

脱式计算,能简便的要用简便方法计算
(1)5120÷32+140
(2)(
1
3
-
1
6
+
4
5
)×30
(3)[1-(
1
2
-
1
4
)]×
2
3

(4)168.1÷(4.3×2-0.4)
(1)5120÷32+140,
=160+140,
=300;

(2)(
1
3
-
1
6
+
4
5
)×30,
=
1
3
×30-
1
6
×30+
4
5
×30,
=10-5+24,
=5+24,
=29;

(3)[1-(
1
2
-
1
4
)]×
2
3

=[1-
1
4
2
3

=
3
4
×
2
3

=
1
2


(4)168.1÷(4.3×2-0.4),
=168.1÷(8.6-0.4),
=168.1÷8.2,
=20.5.
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