题目内容

脱式计算.
(1)0.25×
4
5
+2.5%   
(2)9.6-11÷7+
1
7
×4   
(3)12×[(
11
6
-
2
3
)×3]
(1)0.25×
4
5
+2.5%,
=0.25×0.8+0.025,
=0.2+0.025,
=0.225;

(2)9.6-11÷7+
1
7
×4   
=9.6-11×
1
7
+
1
7
×4,
=9.6-(11-4)×
1
7

=9.6-7×
1
7

=9.6-1,
=8.6;

(3)12×[(
11
6
-
2
3
)×3]

=12×[(
11
6
-
4
6
)×3],
=12×[
7
6
×
3],
=12×
7
2

=42.
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