X+15 :40=44:32 (X-300):5=640:8 1.7:(X-7)=6.8:92 解比例

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X+15 :40=44:32 (X-300):5=640:8 1.7:(X-7)=6.8:92 解比例
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X+15 :40=44:32 (X-300):5=640:8 1.7:(X-7)=6.8:92 解比例
X+15 :40=44:32 (X-300):5=640:8 1.7:(X-7)=6.8:92 解比例

X+15 :40=44:32 (X-300):5=640:8 1.7:(X-7)=6.8:92 解比例
X+15 :40=44:32
  x+15=40*44÷32=55
  x=40;
  (X-300):5=640:8
  x-300=640*5÷8=400
  x=700
  1.7:(X-7)=6.8:92
  x-7=92*1.7÷6.8=23
  x=30