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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