问题 解答题
直接写出答案
(1)8+98+998
(2)2
3
2008
-(
1
5
+1
3
2008
)
=
(3)12.5×5×0.16=
(4)
7
8
÷7=
答案

(1)8+98+998,

=2+2+4+98+998,

=(2+98)+(2+998)+4,

=100+1000+4,

=1104;

(2)2

3
2008
-(
1
5
+1
3
2008
),

=2

3
2008
-
1
5
-1
3
2008

=2

3
2008
-1
3
2008
-
1
5

=1-

1
5

=

4
5

(3)12.5×5×0.16,

=12.5×5×(0.4×0.4),

=12.5×5×0.4×0.4,

=(12.5×0.4)×(5×0.4),

=5×2,

=10;

(4)

7
8
÷7,

=

7
8
×
1
7

=

1
8

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