= -3.14×35.2-6.28×23.3-1.57×36.4= -1.57×2×35.2 - 1.57×4×23.3 - 1.57×36.4= -1.57×70.4 - 1.57×93.2 - 1.57×36.4= -1.57×（70.4+93.2+36.4）= -1.57×200= -314
