问题
填空题
1964×(
|
答案
1964×(
-1 43
)+43×(1 2007
-1 1964
)-2007×(1 2007
+1 1964
)+31 43
=
-1964 43
+1964 2007
-43 1964
-43 2007
-2007 1964
+32007 43
=(
-1964 43
)-(2007 43
+1964 2007
)+(43 2007
-43 1964
)+32007 1964
=-1-1-1+3
=-3+3
=0
故答案为:0.