Аннотация:The charmless three-body decays B_{(s}_{)}^{0} → K0S h+ h′− (where h(′) = π, K) are analysed using a sample of pp collision data recorded by the LHCb experiment, corresponding to an integrated luminosity of 3 fb−1. The branching fractions are measured relative to that of the B0 → K0S π+ π− decay, and are determined to be: Br(B0→K0SK±π∓/Br(B0→K0SK+π−)=0.123±0.009(stat)±0.015(syst),Br(B0→K0SK+K−)/Br(B0→K0Sπ+π−)=0.549±0.018(stat)±0.033(syst),Br(B0s→K0Sπ+π−)/Br(B0→K0Sπ+π−)=0.191±0.027(stat)±0.031(syst)±0.011(fs/fd),Br(B0s→K0SK±π∓)/Br(B0→K0Sπ+π−)=1.70±0.07(stat)±0.11(syst)±0.10(fs/fd),Br(B0s→K0SK+K−)/Br(B0→K0Sπ+π−)∈[0.008−0.051] at 90% confidencelevel, fractions of the B0s and B0 mesons.