  We report on a study of three-body charmless decays B+ => K+h+h-$ based on a
29.1 fb^{-1} data sample collected with the Belle detector. With no assumptions
on the intermediate mechanisms, the following three-body branching fractions
have been measured for the first time: Br(B+ => K+pi-pi+) =
(55.6\pm5.8\pm7.7)x10^{-6} and Br(B+ => K+K-K+) = (35.3\pm3.7\pm4.5)x10^{-6}.
We present the first observation of the decay B+ => f_0(980)K+ with a branching
fraction product of Br(B+ => f_0(980)K+)xBr(f_0(980) => \pi+\pi-)=
(9.6^{+2.5+1.5+3.4}_{-2.3-1.5-0.8})x10^{-6}. This is the first reported example
of a B meson decay to a scalar pseudoscalar final state. We also report the
first observation of B+ => K*(892)^0 pi+ decay with a branching fraction of
Br(B+ => K*(892)^0 pi+) = (19.4^{+4.2+2.1+3.5}_{-3.9-2.1-6.8})x10^{-6}.
