下面各题怎样简便就怎样算14.4÷0.125÷8(16+18)×24×152.34×56-23.4×5.61.5×45+0.8×5.5+2×451005÷[42×(56-57)]1235÷[1-(15+17)].-数学

题文

下面各题怎样简便就怎样算
14.4÷0.125÷8
1
6
+
1
8
)×24×
1
5
2.34×56-23.4×5.6
1.5×
4
5
+0.8×5.5+2×
4
5
1005÷[42×(
5
6
-
5
7
)]
12
35
÷[1-(
1
5
+
1
7
)].
题型:解答题  难度:中档

答案

(1)14.4÷0.125÷8,
=14.4÷(0.125×8),
=14.4÷1,
=14.4;

(2)(
1
6
+
1
8
)×24×
1
5

=
1
6
×24×
1
5
+
1
8
×24×
1
5

=
4
5
+
3
5

=
7
5


(3)2.34×56-23.4×5.6,
=2.34×56-2.34×56
=2.34×(56-56),
=0;

(4)1.5×
4
5
+0.8×5.5+2×
4
5

=1.5×0.8+0.8×5.5+2×0.8,
=(1.5+5.5+2)×0.8,
=9×0.8,
=7.2;

(5)1005÷[42×(
5
6
-
5
7
)],
=1005÷[42×
5
6
-42×
5
7
],
=1005÷[35-30],
=1005÷5,
=201;

(6)
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