2839
1339
3928
8413
Correct answer is A
13÷[57(910−1+34)] 13÷[57(910−1010+34)] = 13÷[57(−110+34)] = 13÷[57(−2+1520)] = 13÷[57×1320] 13+[1328] = 13×2813 = 2839
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