题目内容

用你喜欢的方法脱式计算.
(1)128+750÷25×18
(2)(800×
4
5
-360)÷40
(3)
13
8
×
3
7
+
3
8
×
3
7

(4)[1-(
1
2
-
1
4
)]×
2
3
(1)128+750÷25×18
=128+30×18,
=128+540,
=668;

(2)(800×
4
5
-360)÷40
=(640-360)÷40,
=280÷40,
=7;

(3)
13
8
×
3
7
+
3
8
×
3
7

=(
13
8
+
3
8
)×
3
7

=2×
3
7

=
6
7


(4)[1-(
1
2
-
1
4
)]×
2
3

=[1-
1
4
2
3

=
3
4
×
2
3

=
1
2
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