23×(1/53+1/76)−53×(1/23−1/76)+76×(1/23−1/53).
问题描述:
23×(
+1 53
)−53×(1 76
−1 23
)+76×(1 76
−1 23
). 1 53
答
23×(
+1 53
)-53×(1 76
-1 23
)+76×(1 76
-1 23
)1 53
=
+23 53
-23 76
+53 23
+53 76
-76 23
76 53
=
+23−76 53
+76 76
23 23
=-1+1+1
=1.