题目内容

脱式计算,能简算的必须简算,并写出主要过程.
808×1.25
8.6×[1÷(12.1-12.09)]
8
15
+
4
7
-
1
2
)×
14
25

9
1
2
×3.8+
1
5
×9.5
(1)808×1.25,
=(800+8)×1.25,
=800×1.25+8×1.25,
=1000+10,
=1010;

(2)8.6×[1÷(12.1-12.09)],
=8.6×[1÷0.01],
=8.6×100,
=860;

(3)
8
15
+
4
7
-
1
2
)×
14
25

=
8
15
+
1
14
×
14
25

=
8
15
+
1
25

=
43
75


(4)9
1
2
×3.8+
1
5
×9.5

=9
1
2
×(3.8+0.2),
=9
1
2
×4,
=38.
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