(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)

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/08 00:17:46

(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)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)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) / [8×(1+8+27)
=27×38 / (8×36)
=3×19 / (4×4)
=57 / 16
这个答案好不好呢?

(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)=3.5625