谁能回答这个数字题?
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1 / ABC /(AB + BC + AC)= 1 / A + 1 / B + 1 / C
A + B / AB = 3 B + C / BC = 4 A + C / AC = 5
1 / A + 1 / B + 1 / C + 1 / B + 1 / A + 1 / C = 12
1 / A + 1 / B + 1 / C = 6
1 / ABC /(AB + BC + AC)= 1 / A + 1 / B + 1 / C = 6
BR> ABC /(AB + BC + AC)= 1/6
A + B / AB = 3 B + C / BC = 4 A + C / AC = 5
1 / A + 1 / B + 1 / C + 1 / B + 1 / A + 1 / C = 12
1 / A + 1 / B + 1 / C = 6
1 / ABC /(AB + BC + AC)= 1 / A + 1 / B + 1 / C = 6
BR> ABC /(AB + BC + AC)= 1/6
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