问题 填空题
正确计算.
(1)0.008×0.000125+0.0125÷0.04=______
(2)1-
1
2
-
1
20
-
1
200
-
1
2000
=______.
答案

(1)0.008×0.000125+0.0125÷0.04,

=0.008×0.000125+0.000125×100÷0.04,

=0.000125×(0.008+100÷0.04),

=0.000125×(0.008+2500),

=0.000125×2500.008,

=0.312501;

(2)1-

1
2
-
1
20
-
1
200
-
1
2000

=1-(

1
2
+
1
20
+
1
200
+
1
2000
),

=1-(

1000
2000
+
100
2000
+
10
2000
+
1
2000
),

=1-

1111
2000

=

889
2000

故答案为:0.312501,

889
2000

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