a) (-25).8.(-125).3.(-4)
= (-25).(-4).(-125).8.3 = 100.(-1000).3 = -3000000
b) 147.333 + 233.(-147) = 147.333 – 233.147 = 147.( 333-233) = 147.100 = 14700
c) (-115).27 + 33.(-115) = (-115). (27 + 33) = -115.60= -6900
d) -284.172 + (-284).(-72) = -284. (172-72) = -284.100 = -28400