[求助]求 a , b 值的範圍

templenew

原矩陣
[..1....(1/3)....(1/5) ]  geometric mean =0.4
[.. 3.....1......(1/4) ]   geometric mean =0.9
[..5.......4........1...]   geometric mean =2.7

調整後矩陣
[…..1…...(1/3 + a)....(1/5) ]  geometric mean =0.7
[.. (3-b)….....1..........(1/4) ]   geometric mean =0.5
[…..5...........4..............1...]   geometric mean =2.7
式子為:
((a11 * (a12 + a) * a13) ^ (1/3)) / (sigma (ai1 * a i2 * ai3) ^(1/3)) – 0.1 + 0.9 –  
((a21-b) * a22 * a23) ^ (1/3)) / (sigma (ai1 * a i2 * ai3) ^(1/3)) > 0.5
求 a , b 值的範圍