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3a+4b=6.2(1) 2a+5b=6(2) (2)×3-(1)×2 15b-8b=18-12.4 7b=5.6 b=0.8 將b=0.8代入(2) 2a+4=6 2a=2 a=1 此方程組的解為:a=1,b=0.8.
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