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ȦÊý = [µç¸ÐÁ¿* { ( 18*Ȧֱ¾¶(…¼)) + ( 40 * Ȧ³¤(…¼))}] ¡Â Ȧֱ¾¶ (…¼)
ȦÊý = [8.116 * {(18*2.047) + (40*3.74)}] ¡Â 2.047 = 19 Ȧ
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