76×(1/23-1-63)+23×(1/53+1/76)-53×(1/23-1/76)=()。
A.15/38
B.15/76
C.1
D.2
0,0,1,5,23,() A.119 B.79 C.63 D.47
0,0,1,5,23,() A.119 B.79 C.63 D.47
1,3,9,23,53,()。 A. 89 B. 115 C. 143 D. 165
1/23/47/815/16()63/64 A.31/34B.33/34C.31/32D.23/32
1,3,9,23,53,()。A.89 B.115 C.143 D.165
1/2,3/4,7/8,15/16,(),63/64。A.31/34B.33/34C.31/32D.23/32