问题 解答题
1949×(
1
51
-
1
2000
)+51×(
1
1949
-
1
2000
)-2000×(
1
1949
+
1
51
)+3
答案

1949×(

1
51
-
1
2000
)+51×(
1
1949
-
1
2000
)-2000×(
1
1949
+
1
51
)+3,

=

949
51
-
1949
2000
+
51
1949
-
51
2000
-
2000
1949
-
2000
51

=(

1949
51
-
2000
51
)+(
51
1949
-
2000
1949
)-(
1919
2000
+
51
1949
)+3,

=-1-1-1+3,

=0.

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