问题 解答题
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)
答案

(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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