(0.1*0.3*0.9+0.2*0.6*1.8+0.3*0.9*2.9)除以(0.1*0.2*0.4+0.2*0.4*0.8+0.3*0.6*1.2)

问题描述:

(0.1*0.3*0.9+0.2*0.6*1.8+0.3*0.9*2.9)除以(0.1*0.2*0.4+0.2*0.4*0.8+0.3*0.6*1.2)

  (0.1×0.3×0.9+0.2×0.6×1.8+0.3×0.9×2.9) / (0.1×0.2×0.4+0.2×0.4×0.8+0.3×0.6×1.2)=(1×3×9+2×6×18+3×9×29) / (1×2×4+2×4×8+3×6×12)=27×(1+8+29) / [...