5.6×69.32＋138.64×0.05＋693.2×0.43
=5.6×69.32+69.32*2*0.05+693.2*0.1*10*0.43
=5.6×69.32+69.32*0.1+69.32*4.3
=69.32*(5.6+0.1+4.3)
=69.32*10
=693.2