试题:
有简便方法的要用简便方法
(1)
3
4
÷
1
6
+0.75×8
(2)(
2
3
+
5
12
+
1
19
)×12+
7
19
(3)99999×1.02-33333×0.06.

答案:

我来补答
(1)
3
4
÷
1
6
+0.75×8
=
3
4
×6+
3
4
×8,
=
3
4
×(6+8),
=
3
4
×14,
=
21
2


(2)(
2
3
+
5
12
+
1
19
)×12+
7
19

=
2
3
×12+
5
12
×12+
1
19
×12+
7
19

=8+5+(
12
19
+
7
19
),
=8+5+1,
=14;

(3)99999×1.02-33333×0.06
=99999×1.02-33333×3×0.02,
=99999×1.02-99999×0.02,
=99999×(1.02-0.02),
=99999×1,
=99999.
 
 
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